Easybuild DMU

[Steph Saville]

Sorry it just occurred to me the Ultrascale website is a bit confusing and the first time i ordered the worm and gear set i had no idea what i needed. This is a copy of the web page showing the gear set that i use. You can find it by clicking products on the lefthand of the screen about halfway down the page. In the product section find the worm and gear sets and click it. Scroll to the bottom of the page and you will find this :

 

Worm and Wheel gear sets (0.4 MOD)

13:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

13:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

15:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

15:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

20:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

20:1 Gear set 0.4 MOD. (type 2)

price shown is per set

£6.11 

 

26:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

26:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

30:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

30:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

40:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

40:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

50:1 Gear set 0.4 MOD. (type 1)

Price shown is per set

£5.21 

 

50:1 Gear set 0.4 MOD. (type 2)

Price shown is per set

£6.11 

 

 

Gear type 1 Gear type 2
(no boss) (with boss & grub screw fixing)
Gear Sets with 'WD' Worm Dia. of 0.250" 6.35mm

'CD' 'GD' 'WL' 'FW' 'BW' 'BD' Gear
Centre Gear Worm Face Boss Boss Type
Ratio Dist. Dia. Length Width Width Dia. available

13:1 0.310" 0.428" 0.375" 0.125" (1) 2ST TMB
7.87mm 10.87mm 9.53mm 3.18mm

13:1 0.324" 0.455" 0.375" 0.100" 0.145" 0.375" (1&2) 2ST
8.23mm 11.58mm 9.53mm 2.54mm 3.68mm 9.53mm

15:1 0.348" 0.503" 0.375" 0.100" 0.145" 0.375" (1&2) 2ST
8.84mm 12.78mm 9.53mm 2.54mm 3.68mm 9.53mm

20:1 0.425" 0.653" 0.375" 0.125" (1) 2ST THSL
10.80mm 16.59mm 9.53mm 3.18mm

20:1 0.425" 0.653" 0.375" 0.100" 0.145" 0.375" (1&2) 2ST
10.80mm 16.59mm 9.53mm 2.54mm 3.68mm 9.53mm

26:1 0.313" 0.435" 0.375" 0.125" (1) TT3
7.95mm 11.05mm 9.53mm 3.18mm

26:1 0.324" 0.455" 0.375" 0.100" 0.145" 0.375" (1&2)
8.23mm 11.58mm 9.53mm 2.54mm 3.68mm 9.53mm

30:1 0.348" 0.503" 0.375" 0.100" 0.145" 0.375" (1&2)
8.84mm 12.78mm 9.53mm 2.54mm 3.68mm 9.53mm

40:1 0.425" 0.653" 0.375" 0.125" (1) THSL
10.80mm 16.59mm 9.53mm 3.18mm

40:1 0.425" 0.653" 0.375" 0.100" 0.145" 0.375" (1&2)
10.80mm 16.59mm 9.53mm 2.54mm 3.68mm 9.53mm

50:1 0.503" 0.819" 0.375" 0.100" 0.145" 0.375" (1&2)
12.78mm 20.80mm 9.53mm 2.54mm 3.68mm 9.53mm
'WD' Worm Dia. 'WB' Worm Bores available
0.250" [6.35mm] 1.5mm, 1.8mm, 2.0mm or 3/32"

Ratio 'GB' Gear Bores available
All 1/8", 9/64" or 3/16"

Additional Information/Options:

• 'GS' Grub Screw - 6 B.A., 1/8" long. • 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. • All worms are manufactured from injection moulded Nylatron GS. • 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.

 

I use the type 2 gears that have a flange and a grub screw to grip the axle, pick whatever ratio you want and click on it. On the page for that ratio are 2 drop boxes. Pick your axle size for the brass gear (3/16" for O gauge) and shaft diameter for your worm (2mm for a Mashima 1833 type motor). When you come to fit them the axle gear is self explanatory and the worm pushes on to the motor shaft with some liquid thread lock, just rough up the shaft with some fine grit sandpaper for a key first.

 

Took me ages to figure it out lol !!! 

 

Cheers, Steve