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Old 03-12-2017, 12:10 AM   #11
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Hi
Got the TB6560 from ebay for 10.27 dollars free postage.
http://www.ebay.com.au/itm/CNC-Route...-/371474309278

Sainsmart sell them although a little more expensive. They all look to made by the same company.
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Old 03-13-2017, 06:36 PM   #12
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How do you intent to lock the spindle when machining the work. A brake of some sort?


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Old 03-13-2017, 08:32 PM   #13
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Yes I was thinking that I may have to lock it down some how but for small parts If you check out cfellows thread
http://www.homemodelenginemachinist....ad.php?t=17896
I may not have to do this but I haven't tried it out yet. I really made this for a rotary table which won't be that far down the track.
Got me thinking now .
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Old 03-14-2017, 09:42 AM   #14
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I'd wait until you try it, you might be surprised how much holding torque your stepper motor has.
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Old 03-14-2017, 06:18 PM   #15
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Default Locking spindle

Having worked with RT's, DH's and simple indexers, When you try to square the end of a .625 round to .500. you will find out what kind of forces are put into the work from the cutting tool. Both my DH, and RT's have spindle locks, even though they have worm gearing. 40:1, and 90:1. These can't backfeed torque, but any backlash in the gearing shows in the work. A toothed belt is not a good choice as applied here.
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Old 03-14-2017, 08:26 PM   #16
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I'll have to give it a go on the weekend and see how much chatter going to happen.
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Old 03-15-2017, 01:43 PM   #17
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Quote:
Originally Posted by MachineTom View Post
Having worked with RT's, DH's and simple indexers, When you try to square the end of a .625 round to .500. you will find out what kind of forces are put into the work from the cutting tool. Both my DH, and RT's have spindle locks, even though they have worm gearing. 40:1, and 90:1. These can't backfeed torque, but any backlash in the gearing shows in the work. A toothed belt is not a good choice as applied here.
First one I built had a massive type 42 motor on it and quite a low belt drive reduction. First job I did was a set of splines and after two splines the job was scrap as they were traveling in a spiral due to cutting forces.

That went into the scrap bin and got replaced by a stepper driven dividing head at 40:1 ratio and never looked back.

These belt driven ones seem to come from China as positioning for laser cutters where it's all non contact but now, because they are easy to make they have gotten very popular but I question how many actually get used ?


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