Ultrascale Products

Specific Gear Data:

Contrate	'OS1'	'CW'	'FW'	'CB'
Type	Offset 1	Contrate Width	Face Width	Contrate Bore
1	0.157" [3.99mm]	0.162" [4.11mm]	0.079" [2.00mm]	2.0mm
2	0.210" [5.33mm]	0.194" [4.93mm]	not applicable	2.0mm or 1/8"

Common Gear Data:

'OS2' - Offset 2	0.344" [8.74mm]
'CD' - Contrate Dia.	0.460" [11.68mm]
'BD' - Boss Dia.	0.187" [4.75mm]
'PB' - Pinion Bore	1.0mm, 1.5mm or 2.0mm
'IP' - Intergral Pinion (type 1 only)	15teeth, 100DP and is moulded with the contrate.

Additional Information/Options:

• These gear sets can be used as an alternative to the standard worm and wheel to drive at 90 dregrees.
• Both gear sets have a ratio of 2.9:1.
• The Contrate and Pinion are manufactured from injection moulded Nylatron GS.
• The type 1 contrate has a 2.0mm reamed bore in a Brass bush.
• All other bores are a push fit on to the indicated bore size.
• Product Specific Information/Options can be seen by clicking on the product description.

Specific Gear Data:

Number	'GD'	Gear
of Teeth	Gear Dia.	Type Available
30	0.317" [8.05mm]	1&2
38	0.400" [10.16mm]	1&2
40	0.418" [10.62mm]	1&2
50	0.517" [13.13mm]	1&2

Common Gear Data:

'FW' - Face Width	0.115" [2.92mm]
'BW' - Boss Width	0.080" [2.03mm]
'BD' - Boss Dia.	0.250" [6.35mm]
'GB' - Gear Bore	2.0mm or 1/8"
'GS' - Grub Screw	1.6mm x 0.35mm, 2mm long

Additional Information/Options:

• Product Specific Information/Options can be seen by clicking on the product description.
• All helical gears are manufactured from Brass.
• These special gears are duplicates of the worm wheels shown in the 'Fine pitch tooth range (100 DP)' Worm and Wheel gear sets section. Except they have a LEFT HAND HELIX, which allows them to be meshed with the RIGHT HAND HELIX worm wheels. This gets rid of the need to use spur gears as a secondary drive when space is a problem on width in some applications.
• DO NOT TRY TO MESH THE WORM WITH THE LEFT HAND HELIX GEAR.

Additional Information/Options:

• Product Specific Information/Options can be seen by clicking on the product description.

Specific Gear Data:

Number	'GD'	'FW'	'BW'	'BD'	Gear
of Teeth	Gear Dia.	Face Width	Boss Width	Boss Dia.	Type Available
15	0.170" [4.32mm]	0.100" [2.54mm]	0.080" [2.03mm]	0.125" [3.18mm]	2
18	0.200" [5.08mm]	0.075" [1.91mm]	not applicable	not applicable	1
21	0.230" [5.84mm]	0.075" [1.91mm]	not applicable	not applicable	1
24	0.260" [6.60mm]	0.075" [1.91mm]	not applicable	not applicable	1
30	0.320" [8.13mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
31	0.330" [8.38mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
34	0.360" [9.14mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
37	0.390" [9.91mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
39	0.410" [10.41mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
42	0.440" [11.18mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
44	0.460" [11.68mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
45	0.470" [11.94mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
52	0.540" [13.72mm]	0.075" [1.91mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2

Common Gear Data:

'GB' - Gear Bore (15 Teeth)	1.0mm, 1.5mm or 2.0mm
'GB' - Gear Bore (18 Teeth & above)	2.0mm or 1/8"
'GS' - Grub Screw	1.6mm x 0.35mm, 2mm long

Additional Information/Options:

• To calculate centre distances and outside diameters see 'Spur gear calculations' below.
• The 15 tooth pinion is manufactured from injection moulded Nylatron GS and has no grub screw fixing.
• Gears with 18 teeth and above are manufactured from Brass.
• Product Specific Information/Options can be seen by clicking on the product description.

Spur gear calculations

To work out the centre distance and outside diameter for the above spur gears and pinions, the following formula should be used.

Centre distance (for spur gears only)

Add to gether the number of teeth in both gears, then divide this figure by twice the DP the resulting figure will be the centre distance.

i.e. for two 100 DP gears one 30T and one 45T the centre distance in Inches=(30 + 45) / (2 * 100)

The centre distance that the calculation returns is for the two spur gears in tight mesh. Some allowance will have to be made for backlash. This amount will vary depending on the tooth size of the gears and the manufacturing tolerances.

Outside diameter (for spur gears only)

Add 2 to the number of teeth in the gear, then divide this figure by the DP the resulting figure will be the outside diameter.

i.e. for a 64 DP gear with 22T the outside diameter in Inches=(22 + 2) / 64

The outside diameter that the calculation returns is for the gear at its correct size. However, this size will vary slightly due to manufacturing tolerances.

Module to DP (for use with the above calculations when using MOD. tooth size gears)

Divide 25.4 by the Module(MOD.) size, the resulting figure will be the DP equivalent of the MOD. size.

i.e. for a 0.4MOD. gear the DP=25.4 / 0.4

'Corrected gears' are indicated by a * mark which follows their actual number of teeth. Following this in brackets will be the number of teeth which should be used when doing any calculations involving these gears. (see example below for two 64 DP spur gears)

To calculate the centre distance for a 13T * (14T) pinion and a 22T spur gear.

The number of teeth which should be used are 14T and 22T, this will give the correct centre distance. If you use 13T and 22T the centre distance will be incorrect.

To help you with these calculations, two on-line calculators are available to calculate the centre distance and outside diameter of spur gears. Results are displayed in both Inches and Millimetres.

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Tooth size 100DP

Specific Gear Data:

Number	'GD'	Gear
of Teeth	Gear Dia.	Type Available
14* (15)	0.170" [4.32mm]	1
18	0.200" [5.08mm]	1
21	0.230" [5.84mm]	1
28	0.300" [7.62mm]	1
30	0.320" [8.13mm]	1
34	0.360" [9.14mm]	1
37	0.390" [9.91mm]	1

Common Gear Data:

'GB' - Gear Bore (14* (15) Teeth)	2.0mm
'GB' - Gear Bore (18 Teeth & above)	1/8"
'FW' - Face Width	0.054" [1.37mm]

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Tooth size 64DP

Specific Gear Data:

Number	'GD'	Gear
of Teeth	Gear Dia.	Type Available
13* (14)	0.250" [6.35mm]	1
14	0.250" [6.35mm]	1
16	0.281" [7.14mm]	1
18	0.313" [7.95mm]	1
22	0.375" [9.53mm]	1

Common Gear Data:

'GB' - Gear Bore (13* (14) Teeth)	1/8"
'GB' - Gear Bore (14 Teeth & above)	1/8"
'FW' - Face Width	0.054" [1.37mm]

Additional Information/Options:

• These spur gears and pinions have been produced for the smaller scale modeller, but primarily for the 2mm scale. The gears have a reduced face width compared with our standard range.
• Product Specific Information/Options can be seen by clicking on the product description.
• To calculate centre distances and outside diameters see 'Spur gear calculations' below.
• The * indicates a 'Corrected gear'. (see 'Spur gear calculations' below for details)
• All gears are manufactured from Brass.

Spur gear calculations

To work out the centre distance and outside diameter for the above spur gears and pinions, the following formula should be used.

Centre distance (for spur gears only)

Add to gether the number of teeth in both gears, then divide this figure by twice the DP the resulting figure will be the centre distance.

i.e. for two 100 DP gears one 30T and one 45T the centre distance in Inches=(30 + 45) / (2 * 100)

The centre distance that the calculation returns is for the two spur gears in tight mesh. Some allowance will have to be made for backlash. This amount will vary depending on the tooth size of the gears and the manufacturing tolerances.

Outside diameter (for spur gears only)

Add 2 to the number of teeth in the gear, then divide this figure by the DP the resulting figure will be the outside diameter.

i.e. for a 64 DP gear with 22T the outside diameter in Inches=(22 + 2) / 64

The outside diameter that the calculation returns is for the gear at its correct size. However, this size will vary slightly due to manufacturing tolerances.

Module to DP (for use with the above calculations when using MOD. tooth size gears)

Divide 25.4 by the Module(MOD.) size, the resulting figure will be the DP equivalent of the MOD. size.

i.e. for a 0.4MOD. gear the DP=25.4 / 0.4

'Corrected gears' are indicated by a * mark which follows their actual number of teeth. Following this in brackets will be the number of teeth which should be used when doing any calculations involving these gears. (see example below for two 64 DP spur gears)

To calculate the centre distance for a 13T * (14T) pinion and a 22T spur gear.

The number of teeth which should be used are 14T and 22T, this will give the correct centre distance. If you use 13T and 22T the centre distance will be incorrect.

To help you with these calculations, two on-line calculators are available to calculate the centre distance and outside diameter of spur gears. Results are displayed in both Inches and Millimetres.

Specific Gear Data:

Tooth	'WD'	'WL'	'WB'	Worm	Number
Size	Worm Dia.	Worm Length	Worm Bore	Material	of Starts
100 DP	0.141" [3.58mm]	0.375" [9.53mm]	1.5mm, 1.8mm or 2.0mm	Nylon	1
100 DP	0.189"" [4.80mm]	0.375" [9.53mm]	1.5mm, 1.8mm, 2.0mm or 3/32"	Nylon	1
100 DP	0.189" [4.80mm]	0.195" [4.95mm]	1.0mm, 1.5mm, 1.8mm, 2.0mm or 3/32"	Nylon or Steel	1
0.4 MOD	0.250" [6.35mm]	0.375" [9.53mm]	1.5mm, 1.8mm, 2.0mm or 3/32"	Nylon or Steel	1
0.4 MOD	0.250" [6.35mm]	0.375" [9.53mm]	1.5mm, 1.8mm, 2.0mm or 3/32"	Nylon	2

Additional Information/Options:

• Worms are manufactured from either injection moulded Nylatron GS or Steel, unless otherwise indicated.
• Product Specific Information/Options can be seen by clicking on the product description.
• All worms are single start unless otherwise indicated.

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Gear Sets with 'WD' Worm Dia. of 0.141" [3.58mm]

Specific Gear Data:

	'CD'	'GD'	'BW'	'BD'	Gear
Ratio	Centre Distance	Gear Dia.	Boss Width	Boss Dia.	Type Available
15:1	0.136" [3.45mm]	0.168" [4.27mm]	not applicable	not applicable	1
21:1	0.168" [4.27mm]	0.225" [5.72mm]	not applicable	not applicable	1
30:1	0.215" [5.46mm]	0.317" [8.05mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
38:1	0.250" [6.35mm]	0.400" [10.16mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
40:1	0.261" [6.63mm]	0.418" [10.62mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
46:1	0.292" [7.42mm]	0.479" [12.17mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
50:1	0.310" [7.87mm]	0.517" [13.13mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2

Common Gear Data:

'WD' - Worm Dia.	0.141" [3.58mm]
'GB' - Gear Bore (15:1)	2.0mm
'GB' - Gear Bore (21:1 & above)	2.0mm or 1/8"
'FW' - Face Width	0.115" [2.92mm]
'WL' - Worm Length	0.375" [9.53mm] Nylon only
'WB' - Worm Bore	1.5mm, 1.8mm or 2.0mm
'GS' - Grub Screw	1.6mm x 0.35mm, 2mm long

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Gear Sets with 'WD' Worm Dia. of 0.189" [4.80mm]

Specific Gear Data:

	'CD'	'GD'	'BW'	'BD'	Gear
Ratio	Centre Distance	Gear Dia.	Boss Width	Boss Dia.	Type Available
15:1	0.158" [4.01mm]	0.168" [4.27mm]	not applicable	not applicable	1
21:1	0.187" [4.75mm]	0.225" [5.72mm]	not applicable	not applicable	1
30:1	0.233" [5.92mm]	0.317" [8.05mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
38:1	0.275" [6.99mm]	0.400" [10.16mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
40:1	0.285" [7.24mm]	0.418" [10.62mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
46:1	0.316" [8.03mm]	0.479" [12.17mm]	not applicable	not applicable	1 TT3
46:1	0.316" [8.03mm]	0.479" [12.17mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2
50:1	0.334" [8.48mm]	0.517" [13.13mm]	0.080" [2.03mm]	0.250" [6.35mm]	1&2

Common Gear Data:

'WD' - Worm Dia.	0.189" [4.80mm]
'GB' - Gear Bore (15:1)	2.0mm
'GB' - Gear Bore (21:1 & above)	2.0mm or 1/8"
'FW' - Face Width	0.115" [2.92mm]
'WL' - Worm Length (15:1 to 40:1)	0.195" [4.95mm] Nylon or Steel
'WL' - Worm Length (46:1 to 50:1)	0.375" [9.53mm] Nylon only
'WB' - Worm Bore	1.0mm*, 1.5mm, 1.8mm, 2.0mm or 3/32"
'GS' - Grub Screw	1.6mm x 0.35mm, 2mm long

Additional Information/Options:

• * Only available in the 0.195" [4.95mm] length worm.
• TT3 - This gear set can be used as a direct replacement in Triang TT3 chassis. Gear type 1 will be required with a 1/8" bore.
• Worms are manufactured from either injection moulded Nylatron GS or Steel, unless otherwise indicated.
• All worm wheels are manufactured from Brass.
• All worms are single start unless otherwise indicated.
• Product Specific Information/Options can be seen by clicking on the product description.

Specific Gear Data:

	'CD'	'GD'	Gear
Ratio	Centre Distance	Gear Dia.	Type Available
21:1	0.168" [4.27mm]	0.225" [5.72mm]	1
30:1	0.215" [5.46mm]	0.317" [8.05mm]	1
38:1	0.250" [6.35mm]	0.400" [10.16mm]	1

Common Gear Data:

'WD' - Worm Dia.	0.141" [3.58mm]
'GB' - Gear Bore	1/8"
'FW' - Face Width	0.079" [2.00mm]
'WL' - Worm Length	0.375" [9.53mm] Nylon only
'WB' - Worm Bore	1.5mm

Additional Information/Options:

• These worm and wheel gear sets have been produced for the smaller scale modeller, but primarily for the 2mm scale. The worm wheels in these sets have a reduced face width compared with our standard range to allow for narrower chassis construction.
• Product Specific Information/Options can be seen by clicking on the product description.
• All worms are manufactured from injection moulded Nylatron GS.
• All worm wheels are manufactured from Brass.
• All worms are single start unless otherwise indicated.

Specific Gear Data:

	'CD'	'GD'	'FW'	Gear
Ratio	Centre Distance	Gear Dia.	Face Width	Type Available
13:1	0.310" [7.87mm]	0.428" [10.87mm]	0.125" [3.18mm]	1 2ST TMB
13:1	0.324" [8.23mm]	0.455" [11.58mm]	0.100" [2.54mm]	1&2 2ST
15:1	0.348" [8.84mm]	0.503" [12.78mm]	0.100" [2.54mm]	1&2 2ST
20:1	0.425" [10.80mm]	0.653" [16.59mm]	0.125" [3.18mm]	1 2ST THSL
20:1	0.425" [10.80mm]	0.653" [16.59mm]	0.100" [2.54mm]	1&2 2ST
26:1	0.313" [7.95mm]	0.435" [11.05mm]	0.125" [3.18mm]	1 TT3
26:1	0.324" [8.23mm]	0.455" [11.58mm]	0.100" [2.54mm]	1&2
30:1	0.348" [8.84mm]	0.503" [12.78mm]	0.100" [2.54mm]	1&2
40:1	0.425" [10.80mm]	0.653" [16.59mm]	0.125" [3.18mm]	1 THSL
40:1	0.425" [10.80mm]	0.653" [16.59mm]	0.100" [2.54mm]	1&2
50:1	0.503" [12.78mm]	0.819" [20.80mm]	0.100" [2.54mm]	1&2

Common Gear Data:

'WD' - Worm Dia.	0.250" [6.35mm]
'GB' - Gear Bore	1/8", 9/64" or 3/16"
'BW' - Boss Width	0.145" [3.68mm]
'BD' - Boss Dia.	0.375" [9.53mm]
'WL' - Worm Length	0.375" [9.53mm] Nylon or Steel
'WB' - Worm Bore	1.5mm, 1.8mm, 2.0mm or 3/32"
'GS' - Grub Screw	6B.A., 1/8" long

Additional Information/Options:

• 2ST - Indicates a 2 start gear set.
• TMB - This gear set can be used as a direct replacement in Triang motor bogies. Gear type 1 will be required with a 9/64" bore.
• THSL - This gear set can be used as a direct replacement in Triang/Hornby steam locomotives. Gear type 1 will be required with a 9/64" bore.
• TT3 - This gear set can be used as a direct replacement in Triang TT3 chassis. Gear type 1 will be required with a 1/8" bore.
• Worms are manufactured from either injection moulded Nylatron GS or Steel, unless otherwise indicated.
• All worm wheels are manufactured from Brass.
• All worms are single start unless otherwise indicated.
• Product Specific Information/Options can be seen by clicking on the product description.