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3 files changed, +78 −16 1.1.0: Looks like a bearing: rings and rolling elements. detail = simple keeps one solid ring.

part.py +53 −10

@@ -1,18 +1,61 @@

"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm: envelope for assemblies. The cone (inner ring side) of width B and the cup

(outer ring side) of width C share the overall width T: drawn as one solid ring d x D x T. Rollers and cage are not modelled. Axis along Z, centred."""

"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = "full": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = "simple": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2."""

import math

from steve import Model

designation = "30204" # Bearing number

detail = "full" # full: rings and rolling elements; simple: one solid

# number: (d, D, T, B, C). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, boundary dimensions.

BEARINGS = {"30203": (17, 40, 13.25, 12, 11), "30204": (20, 47, 15.25, 14, 12), "30205": (25, 52, 16.25, 15, 13), "30206": (30, 62, 17.25, 16, 14), "30207": (35, 72, 18.25, 17, 15), "30208": (40, 80, 19.75, 18, 16), "30209": (45, 85, 20.75, 19, 16), "30210": (50, 90, 21.75, 20, 17), "30302": (15, 42, 14.25, 13, 11), "30303": (17, 47, 15.25, 14, 12), "30304": (20, 52, 16.25, 16, 13), "30305": (25, 62, 18.25, 17, 15), "30306": (30, 72, 20.75, 19, 16), "30307": (35, 80, 22.75, 21, 18), "30308": (40, 90, 25.25, 23, 20), "30309": (45, 100, 27.25, 25, 22), "30310": (50, 110, 29.25, 27, 23)}

# number: (d, D, T, B, C, r, r1). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, https://www.ntnglobal.com/en/products/catalog/pdf/2203E.pdf

BEARINGS = {"30203": (17, 40, 13.25, 12, 11, 1, 1), "30204": (20, 47, 15.25, 14, 12, 1, 1), "30205": (25, 52, 16.25, 15, 13, 1, 1), "30206": (30, 62, 17.25, 16, 14, 1, 1), "30207": (35, 72, 18.25, 17, 15, 1.5, 1.5), "30208": (40, 80, 19.75, 18, 16, 1.5, 1.5), "30209": (45, 85, 20.75, 19, 16, 1.5, 1.5), "30210": (50, 90, 21.75, 20, 17, 1.5, 1.5), "30302": (15, 42, 14.25, 13, 11, 1, 1), "30303": (17, 47, 15.25, 14, 12, 1, 1), "30304": (20, 52, 16.25, 16, 13, 1.5, 1.5), "30305": (25, 62, 18.25, 17, 15, 1.5, 1.5), "30306": (30, 72, 20.75, 19, 16, 1.5, 1.5), "30307": (35, 80, 22.75, 21, 18, 2, 1.5), "30308": (40, 90, 25.25, 23, 20, 2, 1.5), "30309": (45, 100, 27.25, 25, 22, 2, 1.5), "30310": (50, 110, 29.25, 27, 23, 2.5, 2)}

d, D, T, B, C = BEARINGS[designation]

d, D, T, B, C, r, r1 = BEARINGS[designation]

W = T

model = Model()

with model.sketch("rings", on="XY", name="Rings") as sk:

sk.circle("outer", (0, 0), D / 2)

sk.circle("bore", (0, 0), d / 2)

model.extrude("body", "rings", distance=T, both=True, name="Bearing")

model.material("steel-generic", color="#b9bdc2")

if detail == "simple":

outline = [(d / 2 + r, -W / 2), (D / 2 - r, -W / 2), (D / 2, -W / 2 + r), (D / 2, W / 2 - r), (D / 2 - r, W / 2), (d / 2 + r, W / 2),

(d / 2, W / 2 - r), (d / 2, -W / 2 + r)]

with model.sketch("section", on="XZ", name="Section") as sk:

sk.polyline("ring", outline, closed=True)

model.revolve("inner", "section", axis="Z", name="Bearing")

else:

angle = math.radians(14)

section = (D - d) / 2

mean_r = (D + d) / 4

roller = 0.2 * section # mean roller radius

roller_length = 0.72 * C

slope = math.tan(angle)

offset = (roller * 1.04) / math.cos(angle)

def cone_race(z):

return mean_r - offset - z * slope

def cup_race(z):

return mean_r + offset - z * slope

cone_top = -T / 2 + B

cup_low = T / 2 - C

rib = 0.35 * roller

rib_z = -T / 2 + 0.16 * B

cone = [(d / 2 + r, -T / 2), (cone_race(rib_z) + rib, -T / 2), (cone_race(rib_z) + rib, rib_z), (cone_race(rib_z), rib_z), (cone_race(cone_top), cone_top), (d / 2 + 0.3 * r, cone_top), (d / 2, cone_top - 0.3 * r), (d / 2, -T / 2 + r)]

cup = [(cup_race(cup_low), cup_low), (D / 2 - 0.3 * r1, cup_low), (D / 2, cup_low + 0.3 * r1), (D / 2, T / 2 - r1), (D / 2 - r1, T / 2), (cup_race(T / 2), T / 2)]

with model.sketch("cone_section", on="XZ", name="Cone section") as sk:

sk.polyline("cone_ring", cone, closed=True)

model.revolve("cone", "cone_section", axis="Z", op="new", body="cone_body", name="Cone")

with model.sketch("cup_section", on="XZ", name="Cup section") as sk:

sk.polyline("cup_ring", cup, closed=True)

model.revolve("cup", "cup_section", axis="Z", op="new", body="cup_body", name="Cup")

ux, uz = -math.sin(angle), math.cos(angle)

nx, nz = math.cos(angle), math.sin(angle)

r_big, r_small = roller * 1.12, roller * 0.88

a = (mean_r - ux * roller_length / 2, -uz * roller_length / 2)

b = (mean_r + ux * roller_length / 2, uz * roller_length / 2)

with model.sketch("roller_section", on="XZ", name="Roller section") as sk:

sk.polyline("roller_half", [a, b, (b[0] + nx * r_small, b[1] + nz * r_small), (a[0] + nx * r_big, a[1] + nz * r_big)], closed=True)

model.revolve("roller", "roller_section", axis=((mean_r, 0, 0), (ux, 0, uz)), op="new", body="roller_body", name="Roller")

rollers = max(6, int(2 * math.pi * mean_r / (2.5 * r_big)))

model.circular_pattern("rollers", axis="Z", count=rollers, bodies=["roller_body"], name="Rollers")

model.material("steel-generic")

model.appearance(color="#b9bdc2")

result = model.result()

--- 1.0.0/part.py
+++ 1.1.0/part.py
@@ -1,17 +1,60 @@
-"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm: envelope for assemblies. The cone (inner ring side) of width B and the cup
-(outer ring side) of width C share the overall width T: drawn as one solid ring d x D x T. Rollers and cage are not modelled. Axis along Z, centred."""
+"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = "full": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = "simple": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2."""
+import math
+
 from steve import Model
 
 designation = "30204"  # Bearing number
+detail = "full"  # full: rings and rolling elements; simple: one solid
 
-# number: (d, D, T, B, C). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, boundary dimensions.
-BEARINGS = {"30203": (17, 40, 13.25, 12, 11), "30204": (20, 47, 15.25, 14, 12), "30205": (25, 52, 16.25, 15, 13), "30206": (30, 62, 17.25, 16, 14), "30207": (35, 72, 18.25, 17, 15), "30208": (40, 80, 19.75, 18, 16), "30209": (45, 85, 20.75, 19, 16), "30210": (50, 90, 21.75, 20, 17), "30302": (15, 42, 14.25, 13, 11), "30303": (17, 47, 15.25, 14, 12), "30304": (20, 52, 16.25, 16, 13), "30305": (25, 62, 18.25, 17, 15), "30306": (30, 72, 20.75, 19, 16), "30307": (35, 80, 22.75, 21, 18), "30308": (40, 90, 25.25, 23, 20), "30309": (45, 100, 27.25, 25, 22), "30310": (50, 110, 29.25, 27, 23)}
+# number: (d, D, T, B, C, r, r1). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, https://www.ntnglobal.com/en/products/catalog/pdf/2203E.pdf
+BEARINGS = {"30203": (17, 40, 13.25, 12, 11, 1, 1), "30204": (20, 47, 15.25, 14, 12, 1, 1), "30205": (25, 52, 16.25, 15, 13, 1, 1), "30206": (30, 62, 17.25, 16, 14, 1, 1), "30207": (35, 72, 18.25, 17, 15, 1.5, 1.5), "30208": (40, 80, 19.75, 18, 16, 1.5, 1.5), "30209": (45, 85, 20.75, 19, 16, 1.5, 1.5), "30210": (50, 90, 21.75, 20, 17, 1.5, 1.5), "30302": (15, 42, 14.25, 13, 11, 1, 1), "30303": (17, 47, 15.25, 14, 12, 1, 1), "30304": (20, 52, 16.25, 16, 13, 1.5, 1.5), "30305": (25, 62, 18.25, 17, 15, 1.5, 1.5), "30306": (30, 72, 20.75, 19, 16, 1.5, 1.5), "30307": (35, 80, 22.75, 21, 18, 2, 1.5), "30308": (40, 90, 25.25, 23, 20, 2, 1.5), "30309": (45, 100, 27.25, 25, 22, 2, 1.5), "30310": (50, 110, 29.25, 27, 23, 2.5, 2)}
 
-d, D, T, B, C = BEARINGS[designation]
+d, D, T, B, C, r, r1 = BEARINGS[designation]
+W = T
 model = Model()
-with model.sketch("rings", on="XY", name="Rings") as sk:
-    sk.circle("outer", (0, 0), D / 2)
-    sk.circle("bore", (0, 0), d / 2)
-model.extrude("body", "rings", distance=T, both=True, name="Bearing")
-model.material("steel-generic", color="#b9bdc2")
+if detail == "simple":
+    outline = [(d / 2 + r, -W / 2), (D / 2 - r, -W / 2), (D / 2, -W / 2 + r), (D / 2, W / 2 - r), (D / 2 - r, W / 2), (d / 2 + r, W / 2),
+               (d / 2, W / 2 - r), (d / 2, -W / 2 + r)]
+    with model.sketch("section", on="XZ", name="Section") as sk:
+        sk.polyline("ring", outline, closed=True)
+    model.revolve("inner", "section", axis="Z", name="Bearing")
+else:
+    angle = math.radians(14)
+    section = (D - d) / 2
+    mean_r = (D + d) / 4
+    roller = 0.2 * section   # mean roller radius
+    roller_length = 0.72 * C
+    slope = math.tan(angle)
+    offset = (roller * 1.04) / math.cos(angle)
+
+    def cone_race(z):
+        return mean_r - offset - z * slope
+
+    def cup_race(z):
+        return mean_r + offset - z * slope
+
+    cone_top = -T / 2 + B
+    cup_low = T / 2 - C
+    rib = 0.35 * roller
+    rib_z = -T / 2 + 0.16 * B
+    cone = [(d / 2 + r, -T / 2), (cone_race(rib_z) + rib, -T / 2), (cone_race(rib_z) + rib, rib_z), (cone_race(rib_z), rib_z), (cone_race(cone_top), cone_top), (d / 2 + 0.3 * r, cone_top), (d / 2, cone_top - 0.3 * r), (d / 2, -T / 2 + r)]
+    cup = [(cup_race(cup_low), cup_low), (D / 2 - 0.3 * r1, cup_low), (D / 2, cup_low + 0.3 * r1), (D / 2, T / 2 - r1), (D / 2 - r1, T / 2), (cup_race(T / 2), T / 2)]
+    with model.sketch("cone_section", on="XZ", name="Cone section") as sk:
+        sk.polyline("cone_ring", cone, closed=True)
+    model.revolve("cone", "cone_section", axis="Z", op="new", body="cone_body", name="Cone")
+    with model.sketch("cup_section", on="XZ", name="Cup section") as sk:
+        sk.polyline("cup_ring", cup, closed=True)
+    model.revolve("cup", "cup_section", axis="Z", op="new", body="cup_body", name="Cup")
+    ux, uz = -math.sin(angle), math.cos(angle)
+    nx, nz = math.cos(angle), math.sin(angle)
+    r_big, r_small = roller * 1.12, roller * 0.88
+    a = (mean_r - ux * roller_length / 2, -uz * roller_length / 2)
+    b = (mean_r + ux * roller_length / 2, uz * roller_length / 2)
+    with model.sketch("roller_section", on="XZ", name="Roller section") as sk:
+        sk.polyline("roller_half", [a, b, (b[0] + nx * r_small, b[1] + nz * r_small), (a[0] + nx * r_big, a[1] + nz * r_big)], closed=True)
+    model.revolve("roller", "roller_section", axis=((mean_r, 0, 0), (ux, 0, uz)), op="new", body="roller_body", name="Roller")
+    rollers = max(6, int(2 * math.pi * mean_r / (2.5 * r_big)))
+    model.circular_pattern("rollers", axis="Z", count=rollers, bodies=["roller_body"], name="Rollers")
+model.material("steel-generic")
+model.appearance(color="#b9bdc2")
 result = model.result()

pypart.toml +18 −4

@@ -1,17 +1,24 @@

name = "steve/tapered-roller-bearing"

version = "1.0.0"

version = "1.1.0"

runtime = "steve"

license = "MIT"

summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm, as a boundary-dimension envelope."

description = """Tapered roller bearing (302 and 303 series) as an envelope for assemblies: one solid d x D x T, the overall width. Rollers and \

cage are not modelled. Axis along Z, centred on the origin. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""

summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm,."

description = """Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = \"full\": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = \"simple\": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""

tags = ["bearing", "roller-bearing", "tapered-roller", "iso-355", "metric"]

changes = "Looks like a bearing: rings and rolling elements. detail = simple keeps one solid ring."

[parameters.designation]

type = "choice"

default = "30204"

choices = ["30203", "30204", "30205", "30206", "30207", "30208", "30209", "30210", "30302", "30303", "30304", "30305", "30306", "30307", "30308", "30309", "30310"]

label = "Bearing number"

[parameters.detail]

type = "choice"

default = "full"

choices = ["full", "simple"]

label = "Detail"

description = "full: rings and rolling elements. simple: one solid ring with the same boundary dimensions, for big assemblies."

[[presets]]

id = "30203"

@@ -132,3 +139,10 @@

132

139

aliases = ["30310 bearing", "tapered roller bearing 30310", "4T-30310"]

133

140

standard = "ISO 355"

134

141

142

[[presets]]

143

id = "30204-simple"

144

title = "30204, simple (one solid)"

145

params = { designation = "30204", detail = "simple" }

146

aliases = ["30204 simple"]

147

standard = "ISO 355"

148

--- 1.0.0/pypart.toml
+++ 1.1.0/pypart.toml
@@ -1,17 +1,24 @@
 name = "steve/tapered-roller-bearing"
-version = "1.0.0"
+version = "1.1.0"
 runtime = "steve"
 license = "MIT"
-summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm, as a boundary-dimension envelope."
-description = """Tapered roller bearing (302 and 303 series) as an envelope for assemblies: one solid d x D x T, the overall width. Rollers and \
-cage are not modelled. Axis along Z, centred on the origin. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""
+summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm,."
+description = """Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = \"full\": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = \"simple\": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""
 tags = ["bearing", "roller-bearing", "tapered-roller", "iso-355", "metric"]
+changes = "Looks like a bearing: rings and rolling elements. detail = simple keeps one solid ring."
 
 [parameters.designation]
 type = "choice"
 default = "30204"
 choices = ["30203", "30204", "30205", "30206", "30207", "30208", "30209", "30210", "30302", "30303", "30304", "30305", "30306", "30307", "30308", "30309", "30310"]
 label = "Bearing number"
+
+[parameters.detail]
+type = "choice"
+default = "full"
+choices = ["full", "simple"]
+label = "Detail"
+description = "full: rings and rolling elements. simple: one solid ring with the same boundary dimensions, for big assemblies."
 
 [[presets]]
 id = "30203"
@@ -131,3 +138,10 @@
 params = { designation = "30310" }
 aliases = ["30310 bearing", "tapered roller bearing 30310", "4T-30310"]
 standard = "ISO 355"
+
+[[presets]]
+id = "30204-simple"
+title = "30204, simple (one solid)"
+params = { designation = "30204", detail = "simple" }
+aliases = ["30204 simple"]
+standard = "ISO 355"

README.md +7 −2

@@ -1,7 +1,10 @@

# Tapered roller bearing

302 and 303 series, bore 15 to 50 mm, as an envelope for assemblies: one solid d × D × T (T is the overall width). Axis along Z, centred

on the origin. Rollers, cage and the separate cone and cup aren't modelled.

## Geometry

Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = "full": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = "simple": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2.

**For the fit:** the sourced dimensions below. **For looks only, not for design:** every other proportion named above.

## Source

@@ -29,3 +32,5 @@

Maker names identify the source; this part isn't made by or affiliated with any maker.

Chamfers r and r1 are in `part.py` (`BEARINGS`), from the same tables. No tolerance class is stated yet.

--- 1.0.0/README.md
+++ 1.1.0/README.md
@@ -1,7 +1,10 @@
 # Tapered roller bearing
 
-302 and 303 series, bore 15 to 50 mm, as an envelope for assemblies: one solid d × D × T (T is the overall width). Axis along Z, centred
-on the origin. Rollers, cage and the separate cone and cup aren't modelled.
+## Geometry
+
+Tapered roller bearing, 302 and 303 series, bore up to 50 mm. Bore d, outside diameter D, overall width T, cone width B, cup width C and chamfers r (cone back) and r1 (cup back) are sourced and make the fit. detail = "full": the cone with its back rib, the cup and the tapered rollers at an angle between them. The 14 degree angle, roller size, rib and roller count are proportions for looks, not for design, and never change the fit dimensions; the cage is not drawn. detail = "simple": one solid ring d x D x T. Axis along Z, centred on the origin; cone back face at z = -T/2, cup back face at z = +T/2.
+
+**For the fit:** the sourced dimensions below. **For looks only, not for design:** every other proportion named above.
 
 ## Source
 
@@ -28,3 +31,5 @@
 | 30310 | 50 | 110 | 29.25 | 27 | 23 |
 
 Maker names identify the source; this part isn't made by or affiliated with any maker.
+
+Chamfers r and r1 are in `part.py` (`BEARINGS`), from the same tables. No tolerance class is stated yet.