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11th Aug 2015, 12:40 AM #16Golden Member
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I get a discount as a member of the local makerspace (HobartHackerspace) which I can't get via mail order.
Besides, being in the store gives me a chance to buy shiny things I don't really need.Geoff
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11th Aug 2015, 01:34 AM #17
Hi Geoff,
It may be worth investigating a computer mouse for the encoder wheel or a scrap inkjet printer. There is usually a very salvageable encoder wheel and photo optic sensor on them.
Encoder_Disk.jpgIgnore the centre punch propping up the back edge
At least there has been some progress on the mechanical side. Thanks to PDW, the pulleys have been bored and fit like a treat.
The last image shows the pulleys fitted and the stepper motor where I hope it will be. As the stepper is a close fit where it's shown, there's no room for adjustment so I hope I can get a belt with the required number of teeth. I've ordered a NEMA 23 motor as a replacement which is 3mm smaller than the NEMA 24 shown so it might be adjustable enough.
I've found that the shaft where the larger pulley is attached is not actually the lead-screw shaft. There's a 1:1 gear drive from this shaft to the lead-screw, presumably to provide an offset so the gear will fit into the side housing. The gears involved are not tight and have a large amount of backlash. Hopefully the software can compensate for this
I've also been looking at this Myford project as a model for my cross slide modification.Best Regards:
Baron J.
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11th Aug 2015, 11:12 AM #18Golden Member
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A mouse encoder wont do the job unfortunately as the rotary encoder has to provide a quadrature signal as that's what the controller expects. It also has to provide an index pulse, once per revolution, so the controller knows the position of the spindle.
A quadrature signal will also indicate direction of rotation.
This one looks like a good fit. 1000ppr (pulses per revolution) which give a resolution of 4000 pulses per revolution using quadrature. Index pulse too. Only $30 -$40 on ebay.Geoff
The view from home
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28th May 2023, 09:24 PM #19Still learning ..
- Join Date
- Jul 2005
- Location
- Melbourne
- Posts
- 15
Sieg C6 ELS
Did you ever get this to completion? I have just ordered the 4 axis version from this guy https://kachurovskiy.com/?syclid=ffd...a-6a67c0b3e199 with a view to motorising both lead screw and crossfeed. It is early days but have a servo version of the nema 23 to test whether it is powerful enough for the lead screw (if not it will drive the crossfeed) and 600lpi encoder for the spindle.
Regards
Mike
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29th May 2023, 06:04 AM #20
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