Re: [CAD_CAM_EDM_DRO] Calculations for XL 037 pullies and cutters

Hi John S.,

Yes, I think I see this now. Turn blank dia to OD, cutter tip starts
out on OD, and cuts in by the infeed distance. The cutter has a
specified tip width and the flanks of the tool are at a specified
angle. "FLY" across the edge of the timing belt pulley, then repeat
for each of the tooth locations. That's it?

Thanks for the help!

Alan KM6VV


machines@... wrote:

>
> The XL range of pullies all have a pitch of 0.200"
> The included angle of the cutter is 50 degrees and the width of the
> cutter at the tip is 0.052"
> This can be ground up like a fly cutter and that's all the cutter
> information you need.
>
> The pitch circle diameter of the pulley is found by multipling the
> number of teeth by the pitch and dividing the total by Pi.
> Example shown for 30 Tooth pulley:-
> [30 * 0.200] = 6 / 3.1412 = 1.910" dia
>
> Outside diameter is found by subtracting a constant K from the PCD.
> Same example again:-
> 1.910 - 0.020 = 1.890" dia
> The constant K is 0.020 for the whole of the XL range.
>
> Last piece of information needed is the depth of the cutter infeed.
> Again this is constant throughout the XL range at 0.065" deep.
>
> If anybody want's any more details for other tooth forms like MP, l
> or H series than have a look in the files section for a file called
> pulley.jpg or go to this link:-
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/Pulley.jpg
> All the other detail are shown there. The constant K id in column J
>
> John S.