Shaft Couplings

Given: Detail (part) drawings of an Unprotected Flange Coupling as shown in Fig. 6.8.

Scale: 1:1 (Full Size)

Parts Identified in an Unprotected Flange Coupling:
1. Flange A (with hub, flange disc, bolt holes, keyway)
2. Flange B (with hub, flange disc, bolt holes, spigot/socket recess, keyway)
3. Shaft A
4. Shaft B
5. Key A (Rectangular Sunk Key)
6. Key B (Rectangular Sunk Key)
7. Bolts, Nuts and Washers (typically 3 or 4 sets)

Assembly Procedure (Step-by-Step):

Step 1 – Understand the assembly:
- The two shafts (Shaft A and Shaft B) are to be coupled end-to-end.
- Flange A is fitted on Shaft A using Key A; Flange B is fitted on Shaft B using Key B.
- The two flanges are brought face-to-face; the spigot of one flange fits into the socket (recess) of the other for alignment.
- Bolts pass through the bolt holes in both flanges and are secured with nuts and washers.

Step 2 – Draw the Front View (Upper Half in Section):
- Draw the horizontal axis (shaft centre line) as a chain-dot line.
- Draw the two shafts as rectangles (diameter as given, e.g., $\phi 40$ mm) extending from both sides.
- Draw the hubs of Flange A and Flange B around the respective shafts.
- Show the keyways on the shafts and in the hubs in the sectional half.
- Draw the flange discs of both flanges meeting at the centre.
- Show the spigot (projection) of one flange fitting into the socket (recess) of the other.
- In the upper half (above the centre line): draw the section — apply hatching (thin lines at $45°$) to all cut solid parts (hub, flange disc, shaft cross-section). Bolts passing through bolt holes are not hatched (bolts are not sectioned by convention).
- In the lower half (below the centre line): draw the external (outside) view — show the bolt heads/nuts, the outer profile of flanges and hubs.
- Show all important dimensions: shaft diameter, hub diameter, hub length, flange diameter, flange thickness, bolt circle diameter (PCD), bolt diameter, number of bolts, overall length, keyway dimensions.

Step 3 – Draw the Right Hand Side View (Without Section):
- Project from the front view to the right.
- This view shows the right-side face of Flange B (or Flange A depending on orientation).
- Draw the outer circle of the flange disc.
- Draw the bolt holes (as circles) equally spaced on the pitch circle diameter (PCD).
- Draw the hub circle (concentric).
- Draw the shaft circle (innermost concentric circle).
- Show the nuts (hexagonal or square) on the bolt ends if visible.
- Show centre lines for all circles.
- No hatching (no section in this view).

Step 4 – Dimensioning:
- Dimension all diameters with the $\phi$ symbol: shaft $\phi$, hub outer $\phi$, flange outer $\phi$, bolt circle $\phi$, bolt hole $\phi$.
- Dimension lengths: hub length, flange thickness, overall coupling length.
- Dimension keyway: width $\times$ depth.
- Use leader lines and dimension lines as per SP:46 conventions.

Step 5 – Title Block and Projection Symbol:
- Write Title: ASSEMBLY OF UNPROTECTED FLANGE COUPLING
- Write Scale: 1:1
- Draw the First Angle Projection Symbol (frustum of cone — as used in CBSE/Indian standard) in the title block.

Key Conventions to Follow:
- Centre lines: thin chain-dot lines.
- Cutting plane line shown on the front view.
- Section lines (hatching) at $45°$, equally spaced ($\approx 3$ mm apart).
- Bolts, keys, shafts — not sectioned even if the cutting plane passes through them.
- Hidden lines may be omitted in the sectional view for clarity.

Result: The assembled orthographic views of the Unprotected Flange Coupling are drawn to scale 1:1 with the front view (upper half in section) and the right-hand side view (without section), fully dimensioned with title and projection symbol.

Given: Detail drawings of an Unprotected Flange Coupling — Fig. 6.9.

Scale: 1:1

Parts of Unprotected Flange Coupling:
1. Flange A (with hub and keyway)
2. Flange B (with hub, spigot/socket, and keyway)
3. Shaft A and Shaft B
4. Key A and Key B (Rectangular Sunk Keys)
5. Bolts, Nuts, Washers

Assembly Steps:

Step 1 – Fit keys and flanges on shafts:
- Insert Key A into the keyway of Shaft A; slide Flange A onto Shaft A so that the keyway of the hub aligns with Key A.
- Similarly, fit Key B and Flange B onto Shaft B.
- The flanges are positioned so that the flange faces are flush with the shaft ends.

Step 2 – Couple the flanges:
- Bring Shaft A and Shaft B coaxially together.
- The spigot (male projection) on Flange B enters the socket (female recess) on Flange A for accurate alignment.
- Align the bolt holes of both flanges.
- Insert bolts through the holes; place washers and tighten nuts.

Step 3 – Draw Front View (Lower Half in Section):
- Draw the horizontal axis as a centre line.
- Draw both shafts, hubs, and flange discs symmetrically about the axis.
- Lower half (below centre line): Show the section — hatch all solid cut parts (shaft, hub, flange disc) at $45°$. Do NOT hatch bolts, keys, or nuts.
- Upper half (above centre line): Show the external view — outer profiles of flanges, bolt heads/nuts visible.
- Show spigot-socket fit at the mating face.
- Dimension: shaft $\phi$, hub $\phi$, hub length, flange $\phi$, flange thickness, PCD of bolts, bolt $\phi$, keyway size, overall length.

Step 4 – Draw Right Side View:
- Project from the right end of the front view.
- Draw concentric circles: shaft circle (innermost), hub circle, bolt hole circles on PCD, flange outer circle.
- Show bolt holes (usually 3 or 4) equally spaced on the PCD.
- Show nuts (hexagonal) if visible.
- Mark all centre lines.
- No section in this view.

Step 5 – Title and Symbol:
- Title: ASSEMBLY OF UNPROTECTED FLANGE COUPLING
- Scale: 1:1
- Draw First Angle Projection Symbol.

Result: Assembly drawing of Unprotected Flange Coupling drawn to scale 1:1 with front view (lower half in section) and right side view, with all dimensions, title, and projection symbol.

Given: Assembly drawing of an Unprotected Flange Coupling.
Task: Extract (disassemble) individual parts and draw their detail views.
Scale: 1:1 (Full Size)

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(a) FLANGE-A

Description of Flange-A:
Flange-A consists of a cylindrical hub (with a central bore equal to shaft diameter and a keyway), and a circular flange disc with bolt holes. It may have a socket (recess) for the spigot of Flange-B.

(i) Upper Half Sectional Front View of Flange-A:

Step 1: Draw the horizontal centre line (axis of the bore).

Step 2 – Lower half (external view):
- Draw the outer profile: hub cylinder and flange disc as rectangles.
- Show the outer diameter of the hub and flange disc.
- Show the length of the hub.
- Show the socket recess (if present) on the face of the flange.

Step 3 – Upper half (sectional view):
- The cutting plane passes through the axis.
- Show the bore (shaft hole) through the hub — draw as a rectangle equal to shaft diameter.
- Show the keyway: a small rectangular notch at the top of the bore.
$$\text{Keyway width} = b, \quad \text{Keyway depth} = d$$
- Show the bolt holes in the flange disc (as rectangles in section).
- Show the socket recess depth and diameter.
- Apply hatching at $45°$ to all solid cut material.
- Do NOT hatch the bore (empty space) or keyway.

Step 4 – Dimensions to show:
- Bore diameter $\phi$ (= shaft diameter)
- Hub outer diameter $\phi$
- Hub length
- Flange outer diameter $\phi$
- Flange thickness
- Bolt hole diameter $\phi$ and PCD
- Keyway: width $\times$ depth
- Socket recess: diameter $\phi$ and depth

(ii) Right-Hand Side View of Flange-A:

Step 1: Project from the right side of the front view.

Step 2: Draw concentric circles:
- Innermost: bore circle ($\phi$ = shaft diameter)
- Next: hub outer circle
- Bolt holes: small circles equally spaced on PCD circle
- Outermost: flange outer circle

Step 3: Show the keyway as a small rectangle (chord) inside the bore circle.

Step 4: Draw all centre lines (horizontal, vertical, and radial to bolt holes).

Step 5: Dimension: all diameters, PCD, number and diameter of bolt holes.

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(b) KEY-A (Rectangular Sunk Key)

Description: A rectangular sunk key is a simple rectangular prism with uniform cross-section. It fits half in the shaft keyway and half in the hub keyway.

Let: Length $= L$, Width $= b$, Height (thickness) $= h$

(i) Front View of Key-A:
- The front view shows the key as a rectangle.
- Width of rectangle $= L$ (length of key), Height of rectangle $= h$ (thickness of key).
- Draw with thin lines; show dimensions $L$ and $h$.
$$\text{Front View: Rectangle of size } L \times h$$

(ii) Top View of Key-A:
- The top view shows the key as a rectangle.
- Width $= L$ (length), Depth $= b$ (width of key).
$$\text{Top View: Rectangle of size } L \times b$$
- Draw directly below the front view with projection lines.

(iii) Left-Hand Side View of Key-A:
- The LH side view shows the cross-section of the key.
- It appears as a rectangle of size $b \times h$ (width $\times$ thickness).
$$\text{LH Side View: Rectangle of size } b \times h$$
- Draw to the left of the front view with projection lines.

Dimensions to mark:
- On Front View: $L$ (length) and $h$ (height/thickness)
- On Top View: $b$ (width)
- On Side View: $b$ and $h$ (for confirmation)

Title Block:
- Title: DETAIL DRAWING — UNPROTECTED FLANGE COUPLING
- Parts: FLANGE-A, KEY-A
- Scale: 1:1
- Draw First Angle Projection Symbol.

Given: Assembly drawing of Unprotected Flange Coupling — Fig. 6.12.
Task: Disassemble and draw detail views of Flange-A and Hexagonal Nut.
Scale: 1:1

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(a) FLANGE-A

(i) Front View — Lower Half in Section:

Step 1: Draw the horizontal axis (centre line of bore).

Step 2 – Upper half (external view, above centre line):
- Draw the outer profile of the hub (cylinder) and flange disc.
- Show the face of the flange with the socket recess (if present).
- Show the outer contour lines of hub and flange.

Step 3 – Lower half (sectional view, below centre line):
- The cutting plane passes through the axis.
- Show the bore (shaft hole) as a rectangle.
- Show the keyway as a small rectangular notch at the bottom of the bore.
- Show the bolt holes in the flange disc as rectangles.
- Show the socket recess (depth and diameter) if present.
- Apply hatching ($45°$, equally spaced) to all solid cut material in the lower half.
- Do not hatch the bore or keyway (these are empty spaces).

Step 4 – Dimensions:
- Bore $\phi$, Hub outer $\phi$, Hub length
- Flange outer $\phi$, Flange thickness
- Bolt hole $\phi$, PCD of bolt holes
- Keyway: width $\times$ depth
- Socket recess: $\phi$ and depth

(ii) Side View — Looking from Left:

Step 1: Project from the left side of the front view.

Step 2: Draw concentric circles:
- Bore circle (innermost)
- Hub outer circle
- Bolt hole circles on PCD
- Flange outer circle (outermost)

Step 3: Show the keyway as a small rectangular notch inside the bore circle (at the appropriate position — bottom, since lower half was sectioned, keyway is at bottom).

Step 4: Show all centre lines.

Step 5: Dimension all diameters and PCD.

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(b) HEXAGONAL NUT

Description: A standard hexagonal nut has a hexagonal prism body with a threaded central hole. The top and bottom faces are flat; the top corners are chamfered (giving a curved profile on the front view).

Let: Nominal diameter of bolt $= d$
- Across flats (width across flats): $W = 1.5d + 3$ mm (approx.) or as given
- Thickness of nut: $T \approx 0.8d$ (approx.) or as given
- Chamfer circle diameter $\approx W$ (across flats)

(i) Front View of Hexagonal Nut:

Step 1: Draw the rectangle of width $= W$ (across flats) and height $= T$ (thickness).

Step 2: Show two vertical lines inside the rectangle at positions corresponding to the two visible corners of the hexagon (at distance $=$ across corners $/2$ from centre).

Step 3: Draw the chamfer arcs:
- The chamfer on the top corners produces hyperbolic curves; for drawing purposes, these are approximated as arcs of circles.
- Draw arcs from the top corners curving inward to meet the vertical edge lines.
- The arc radius $R = W$ (across flats) approximately.

Step 4: Show the threaded hole:
- Draw two vertical lines (representing the thread) inside, at diameter $= d$ (minor diameter shown as thin lines, major diameter as thick lines).
- Alternatively, show as two thin lines for the thread representation.

Step 5: Dimension: $W$ (across flats), $T$ (thickness), $d$ (nominal diameter).

(ii) Side View of Hexagonal Nut:

Step 1: Project from the right (or left) of the front view.

Step 2: In the side view, the hexagon appears with two corners pointing left and right (if the front view shows flats).
- Draw the hexagon: it will show as a rectangle of width $=$ across corners and height $= T$, with two angled lines on left and right sides.

Step 3: Show the chamfer arc on top.

Step 4: Show the threaded hole as a circle of diameter $d$ (with a gap/break in the circle to indicate thread — thin circle for minor diameter, thick circle for major diameter).

Step 5: Dimension: across corners dimension, thickness $T$.

Title Block:
- Title: DETAIL DRAWING — UNPROTECTED FLANGE COUPLING
- Parts: FLANGE-A, HEXAGONAL NUT
- Scale: 1:1
- Draw First Angle Projection Symbol.

Given: Detail drawings of a Protected Flange Coupling — Fig. 6.18.
Scale: 1:1

Difference from Unprotected Flange Coupling:
In a Protected Flange Coupling, the bolt heads and nuts are recessed (protected) within the flanges. Each flange has a protective rim (annular projection) that covers/guards the bolt heads and nuts, preventing accidents. There is a clearance gap (typically 3 mm) between the spigot and socket.

Parts of Protected Flange Coupling:
1. Flange A — with hub, protective rim, bolt holes (countersunk/recessed), keyway
2. Flange B — with hub, protective rim, spigot, bolt holes, keyway
3. Shaft A and Shaft B
4. Key A and Key B
5. Bolts, Nuts, Washers

Assembly Steps:

Step 1: Fit Key A into Shaft A keyway; slide Flange A onto Shaft A.

Step 2: Fit Key B into Shaft B keyway; slide Flange B onto Shaft B.

Step 3: Bring the two flanges face-to-face. The spigot of Flange B enters the socket of Flange A (with 3 mm clearance gap between them).

Step 4: Align bolt holes. Insert bolts; the bolt heads sit in the recesses of one flange and nuts in the recesses of the other flange — both protected by the rims.

Step 5: Tighten nuts.

Drawing the Views:

(a) Front View — Lower Half in Section:

Step 1: Draw the horizontal axis (centre line).

Step 2 – Upper half (external view):
- Draw outer profiles of both flanges: hub cylinders, flange discs, and protective rims.
- Show the mating face between the two flanges.
- Show the outer contour of the protective rims.

Step 3 – Lower half (sectional view):
- Show the bore of both hubs (shaft holes).
- Show keyways in the hubs.
- Show the spigot of Flange B fitting into the socket of Flange A with 3 mm clearance gap.
- Show the bolt in section passing through both flanges; bolt head recessed in Flange A rim, nut recessed in Flange B rim.
- Show washers under the nut.
- Apply hatching ($45°$) to all solid cut material: shafts, hubs, flange discs, rims.
- Do NOT hatch bolts, nuts, keys, washers.

Step 4 – Dimensions:
- Shaft $\phi$, Hub outer $\phi$, Hub length
- Flange outer $\phi$, Flange thickness
- Rim outer $\phi$, Rim height
- Bolt $\phi$, PCD, number of bolts
- Spigot $\phi$, Socket $\phi$, Clearance = 3 mm
- Keyway: width $\times$ depth
- Overall length of coupling

(b) Left Hand Side View:

Step 1: Project from the left end of the front view (left side = Flange A side or Flange B side as per the drawing orientation).

Step 2: Draw concentric circles:
- Shaft bore circle (innermost)
- Hub outer circle
- Flange disc outer circle
- Protective rim outer circle (outermost)

Step 3: Show bolt holes (as circles) equally spaced on PCD.

Step 4: Show the keyway as a small rectangular notch inside the bore circle.

Step 5: Show all centre lines.

Step 6: Dimension all diameters, PCD, bolt hole diameter.

Title Block:
- Title: ASSEMBLY OF PROTECTED FLANGE COUPLING
- Scale: 1:1
- Draw First Angle Projection Symbol.

Result: Assembly drawing of Protected Flange Coupling drawn to scale 1:1 with front view (lower half in section) and left-hand side view, with all dimensions, title, and projection symbol.

Given: Assembly drawing of Protected Flange Coupling — Fig. 6.21.
Task: Disassemble and draw detail views of Flange-B and Shaft-B.
Scale: 1:1

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(a) FLANGE-B

Description of Flange-B (Protected type):
Flange-B has a hub (with bore and keyway), a flange disc with bolt holes (recessed for bolt heads/nuts), a protective rim, and a spigot (male projection) on the mating face.

(i) Front View — Upper Half in Section:

Step 1: Draw the horizontal axis (centre line of bore).

Step 2 – Lower half (external view, below centre line):
- Draw the outer profile: hub cylinder, flange disc, protective rim.
- Show the spigot projection on the mating face.
- Show the recess in the rim for bolt head/nut.

Step 3 – Upper half (sectional view, above centre line):
- Show the bore through the hub (rectangle of diameter = shaft diameter).
- Show the keyway as a small rectangular notch at the top of the bore.
$$\text{Keyway: width } b \times \text{depth } d$$
- Show the bolt hole recess in the rim (countersunk or cylindrical recess).
- Show the spigot in section.
- Apply hatching ($45°$) to all solid cut material.
- Do not hatch the bore, keyway, or bolt hole (empty spaces).

Step 4 – Dimensions:
- Bore $\phi$ (= Shaft B diameter)
- Hub outer $\phi$, Hub length
- Flange disc outer $\phi$, Flange thickness
- Rim outer $\phi$, Rim height
- Spigot $\phi$, Spigot height
- Bolt hole $\phi$, PCD, number of bolt holes
- Recess $\phi$ and depth (for bolt head/nut)
- Keyway: width $\times$ depth

(ii) Side View — Viewed from the Right:

Step 1: Project from the right side of the front view.

Step 2: Draw concentric circles (from inside to outside):
1. Bore circle ($\phi$ = shaft diameter)
2. Hub outer circle
3. Spigot circle (if visible from this side)
4. Bolt hole circles on PCD (small circles)
5. Flange disc outer circle
6. Rim outer circle

Step 3: Show keyway as a small rectangular notch inside the bore circle.

Step 4: Show recesses for bolt heads as circles (if visible).

Step 5: Draw all centre lines.

Step 6: Dimension all diameters and PCD.

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(b) SHAFT-B

Description: Shaft-B is a cylindrical shaft with a keyway cut along its length (where Flange-B is fitted). The keyway is a rectangular groove.

Let: Shaft diameter $= d_s$, Shaft length $= L_s$
Keyway: width $= b$, depth $= t$, length $= l_k$

(i) Front View of Shaft-B:

Step 1: Draw the horizontal centre line.

Step 2: Draw the shaft as a rectangle:
- Width $= L_s$ (total length of shaft)
- Height $= d_s$ (diameter)

Step 3: Show the keyway:
- Draw a rectangular notch on the top edge of the shaft rectangle.
- Keyway width $= b$, depth $= t$, length $= l_k$.
- Position the keyway at the end where Flange-B is fitted.

Step 4: Draw centre line along the length.

Step 5: Dimension: $d_s$, $L_s$, keyway $b \times t \times l_k$.

(ii) Side View — Viewed from the Left:

Step 1: Project from the left end of the front view.

Step 2: Draw a circle of diameter $d_s$ (the shaft cross-section).

Step 3: Show the keyway as a rectangular chord at the top of the circle:
- The keyway appears as a rectangle of width $b$ and depth $t$ cut into the top of the circle.
- Draw two vertical lines (width $b$ apart) and a horizontal line (at depth $t$ from the top of the circle).

Step 4: Draw centre lines (horizontal and vertical through the circle centre).

Step 5: Dimension: $d_s$, $b$, $t$.

Title Block:
- Title: DETAIL DRAWING — PROTECTED FLANGE COUPLING
- Parts: FLANGE-B, SHAFT-B
- Scale: 1:1
- Draw First Angle Projection Symbol.

Given: Assembly drawing of Protected Flange Coupling — Fig. 6.22 (Front view upper half in section shown).
Task: Disassemble and draw detail views of Flange-A and Rectangular Sunk Taper Key-A.
Scale: 1:1

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(a) FLANGE-A

Description of Flange-A (Protected type):
Flange-A has a hub (with bore and keyway), a flange disc with bolt holes (recessed), a protective rim, and a socket (female recess) on the mating face for receiving the spigot of Flange-B.

(i) Front View — Lower Half in Section:

Step 1: Draw the horizontal axis (centre line of bore).

Step 2 – Upper half (external view, above centre line):
- Draw the outer profile of Flange-A: hub cylinder, flange disc, protective rim.
- Show the socket recess on the mating face (as a step in the profile).
- Show the outer contour of the rim.
- Show the recess for bolt head/nut in the rim.

Step 3 – Lower half (sectional view, below centre line):
- Show the bore (shaft hole) as a rectangle of diameter = shaft diameter.
- Show the keyway as a small rectangular notch at the bottom of the bore.
$$\text{Keyway: width } b \times \text{depth } t$$
- Show the socket recess: diameter and depth.
- Show the bolt hole recess in the rim.
- Apply hatching ($45°$, equally spaced $\approx 3$ mm) to all solid cut material.
- Do not hatch bore, keyway, socket recess, or bolt holes.

Step 4 – Dimensions:
- Bore $\phi$ (= shaft diameter)
- Hub outer $\phi$, Hub length
- Flange disc outer $\phi$, Flange thickness
- Rim outer $\phi$, Rim height
- Socket recess $\phi$ and depth
- Bolt hole $\phi$, PCD, number of bolt holes
- Recess $\phi$ and depth (for bolt head/nut)
- Keyway: width $\times$ depth

(ii) Side View — Looking from Left:

Step 1: Project from the left side of the front view.

Step 2: Draw concentric circles (from inside to outside):
1. Bore circle ($\phi$ = shaft diameter)
2. Hub outer circle
3. Socket recess circle (if visible from this side)
4. Bolt hole circles on PCD
5. Flange disc outer circle
6. Rim outer circle

Step 3: Show the keyway as a small rectangular notch inside the bore circle (at the bottom, since lower half was sectioned).

Step 4: Show recesses for bolt heads/nuts as circles.

Step 5: Draw all centre lines.

Step 6: Dimension all diameters and PCD.

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(b) RECTANGULAR SUNK TAPER KEY-A

Description:
A Rectangular Sunk Taper Key is similar to a rectangular sunk key but has a taper on its top face (the face that bears against the hub keyway). The standard taper is $1:100$ (i.e., 1 mm rise per 100 mm length). The bottom face is flat (parallel to the shaft axis). One end (the head end) may be thicker.

Let: Length $= L$, Width $= b$
Thickness at thin end $= h_1$, Thickness at thick end $= h_2$
Taper $= 1:100$, so $h_2 - h_1 = L/100$

(i) Front View of Rectangular Sunk Taper Key-A:

Step 1: Draw the horizontal centre line.

Step 2: Draw the key as a trapezoid (not a rectangle) because of the taper:
- Bottom edge: horizontal line of length $L$.
- Left edge (thin end): vertical line of height $h_1$.
- Right edge (thick end): vertical line of height $h_2$ (where h_2 > h_1).
- Top edge: inclined line connecting the top of the left edge to the top of the right edge (showing the taper).

Step 3: The taper is shown by the inclined top surface. Mark the taper as $1:100$ with a taper symbol (a small triangle with the ratio).

Step 4: Dimension:
- Length $L$
- Width $b$ (shown in top view)
- Thickness at thin end $h_1$ and thick end $h_2$
- Taper: $1:100$

(ii) Top View of Rectangular Sunk Taper Key-A:

Step 1: Project below the front view.

Step 2: Draw the top view as a rectangle:
- Length $= L$, Width $= b$
$$\text{Top View: Rectangle of size } L \times b$$

Step 3: The top view appears as a plain rectangle because the taper is in the height direction (not visible from top).

Step 4: Draw centre lines along the length.

Step 5: Dimension: $L$ and $b$.

Note on Taper Key vs. Parallel Key:
- Parallel (straight) key: both front and top views are rectangles.
- Taper key: front view is a trapezoid (showing taper), top view is a rectangle.
- The taper is always marked with the symbol and ratio $1:100$.

Title Block:
- Title: DETAIL DRAWING — PROTECTED FLANGE COUPLING
- Parts: FLANGE-A, RECTANGULAR SUNK TAPER KEY-A
- Scale: 1:1
- Draw First Angle Projection Symbol.