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Hmm. -4v seems low, but if it works... I know I'm abusing the serial port, but I've used this circuit many times may be the prolific device is different to mine???

BTW are you driving it from a...

1) Pass....I didn't get it for my C3 lathe.
2) I'd just get that if it does break. It doesn't seem that likely to happen to me.
3) Good plan, can be pricey though. I often just use a suitable block...

Number eight.

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Personally to start with I would get some morse 2 collets, the er32 collet holder will limit the z travel.
Next get a couple of vices, one rotateable base the other a possible 4" with as little...

For those interested, I thought I'd post my updated stiffness calculation spreadsheet in a new post. This spreadsheet is intended for a typical moving gantry cnc routing machine, and may help with...

16mm x 5mm, drive end fixed, remote end supported, 1500mm long. Critical speed = 933rpm (4600mm/min), load limit ~ 10kN

Hi
Just as a comparison have a look at these:-

http://cgi.ebay.co.uk/3-RM1605-637-1137-1137mm-ballscrews-3-sets-BK-BF12-/250543340577?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a558bfc21

A...

A Tutorial on motor torque calculations

A question oft asked on MYCNCUK is "how big a motor do I need?". There is no simple answer to this, and the options are usually:
a) follow someone elses...