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

Hi John S.,

Where do the width of the tip (.052" XL), and infeed (0.065" XL) come
from?

I have found a "distance from pitch line to belt tooth bottom" (.01"
XL), also known as "Pitch line differential", and seen a "depth of
teeth" term referred to (no numbers) also.

Pressure Angle, Pitch circle, and Outside Diameter are simple, but where
does 'K' come from? Martin and SDP doc's examined so far do not provide.

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.