Misc: Everything Else Belt Drive Conversion

[Chris Launders]

How do you trim them?

They are only rubber with cords inside (nylon, kelvar or whatever), no steel, so I just clamped so much to a block of wood and used a new blade in a Stanley knife up against a steel rule, then moved along a bit and cut further until I had gone all the way round.

 

[davidd]

Hi David There is now a lot of info out there such as belt widths and pully diameters , to complete the picture what is the pitch of the belt and its form please . Roger

Roger,

I believe this is a listing for the belt used on the small Newby clutch, which is 30 mm wide and has 68 teeth. The front pully I use is a 36T.

This belt has 105 T on it and when used with the 36T engine pully, the main shaft center to clutch center is approximately 8.1".

The 840 number is the pitch of the overall belt in mm. The "8MGT" is the sprocket pitch circle 8 mm. The width is 30 mm.

David

 

[Monkeypants]

They are only rubber with cords inside (nylon, kelvar or whatever), no steel, so I just clamped so much to a block of wood and used a new blade in a Stanley knife up against a steel rule, then moved along a bit and cut further until I had gone all the way round.

The belts I have here use multiple steel cables encased in rubber. Perhaps there are a few different types?

Glen

 

[ben kingham]

I noticed the 1/2" spacer mentioned in this thread (Part No. EC1623SP1500A from Cometic) and thought I might be able to save the hassle of making one. I contacted them and was quoted an astonishing $276.53 each....! Plus an extremely unreasonable $320.00 shipping to the UK via FedEx. Must be due to the weight.. although I could send same back the other way via FedEx for under $25. Guess I will get the Jigsaw out.

 

[BrianR]

Yes. Kind of greedy aren’t they! They charged me full price on all but the first one and I’m the one that sent them the cover and explained where it needed additional material. We just need to find someone with a waterjet cutter.

 

[timetraveller]

I get parts for the hydraulic steering damper kits waterjetted out of 10 and 12 mm thick ali. The firm is only a mile from me and normally produces parts in less than a week. They need a DWG or DXF file from ACAD to work from and you would have to be responsible for that. Minimum charge is £50. If this would help let me know. I would need the ACAD file to get a quotation and you might get two for their minimum charge.

 

[BrianR]

Thank you timetraveler, I don’t have an immediate need for one. I was offering to loan the one I have as a pattern.

 

[chark_mandler]

There is an app that can take a photo of a part such as the inside of a primary cover. The app apparently corrects any out of line angle with the camera. This can then be imported to CAD software and the photo traced into the app after setting a known distance. In the case of a primary cover where it would be hard to highlight two points that are a know distance a ruler could be laid alongside and used as the size reference.
A friend who does lots of fabrication and makes cardboard models, opens the models out and then uses the software to photo the opened out cardboard to transfer to CAD and then a DXF of DWG files for the laser/ water cutters.
If anyone is interested I'll find the name of the app.

 

[vibrac]

I think a scan of a gasket (suitably trimed) scaned on a flatbed ,saved as a pdf and copied to an on line pdf to dwg site is the way I would go

 

[timetraveller]

If you can let me have the name of the app I will try to see if I can make it work. I promise nothing but it will be interesting to try.