Re: [CAD_CAM_EDM_DRO] Stepper motor pullies

Hi John,

This was what I found when I made the pulleys for my little contraption -
except that I was using 2.5mm. At this size a 2mm drill seems right. I
wasn't bright enough to ask for technical details like you so I bought one
pulley of each size and knocked the pressed-on flange off. Then I sorted
throught the drills till I found one that fitted the slot neatly, put one in
a slot on each side of the pulley and miked across them - subtract the dia
of one drill and hey-presto - the right PCD. Miked up the OD and drilled 'em
on the ordinary drill press and rotary table (centre drill first pass). I
got the first pulleys from HPC gears at Dronfield - I assume you tried
them??

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK


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----- Original Message -----
From: "stevenson_engineers" <machines@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, August 08, 2002 12:50 AM
Subject: [CAD_CAM_EDM_DRO] Stepper motor pullies


> I needed 6 pulleys to do this, all 22 tooth 5M HTD series.
> Unfortunatly the stockist only had 5, rang round and all the other
> supplies wanted double the price I paid for these.
> Had a look at the specs and found quite a lot of discrepencies.
> So I rang Fenners tech section up who I have a good working
> relationship with. Told them I need to to cut this pulley direct on
> to the end of a motor shaft and didn't have room to mount one, could
> they fax me the info. Sure enough the info came through with all the
> calculations.
> Seems the basis of the 5M series is a semi circle with a diameter of
> 3.1 mm or 0.122" Once you have this and the pitch circle diameter
> it's easy to make these one of three ways.
> [1] drill a series of holes on the pcd and then turn down to the OD