Re: LHT-25B - Small Turret Lathe

On 2/3/2025 5:50 AM, Jim Wilkins wrote:

"Bob La Londe"  wrote in message news:vnp9i2$sm3o$1@dont-email.me...
 ... I'll mostly run standard 5C collets, but
having a chuck may save the day at some point.  The lathe did also come
with an unused/uncut pie collet.  I'm not sure if I am looking forward
to the day when that is the answer to a problem or not.
 -- Bob La Londe
CNC Molds N Stuff
 -------- My limited experience with 5C pot collets is that all but the shortest tubing, bushings etc should be held in axially as well by the tailstock, perhaps with a pipe center or large fender washer, and trimmed to length in the better restrained grip of a 6-jaw. I save hole saw and Greenlee cutouts for such purposes.

Most turret lathes don't have a proper tailstock.  The turret is the tail stocks.  That being said I "also" have a removable tailstock turret I use in the little 8.5x18 Harbor Freight lathe.  I do have a proper set-tru 6 jaw that I almost always leave on the 14x40 Precision Mathews.

 I was given a "Precise SC 42" CNC spindle by a scrap dealer. Fischer USA emailed me the manual for it, which assumes it's connected to their controller and doesn't mention the motor drive specs.

I don't really know what that is?  Picture?  Sounds like a small high speed high frequency 3 phase spindle from what I have read.

Do you have any experience or suggestions concerning their electrical requirements?

Base voltage is probably at max frequency, but I wouldn't know for sure.   For example most of my high speed spindles are 230V at 400hz.  You can probably get that from the manual.  I only found a couple mentions on line with queries similar to yours.  If you are not sure of the wires its pretty simple to find out.  If it has four wires one of them is likely case ground and the other three are the legs of the windings. After that you would need to find rotation.  There is a meter that can help you find phase rotation.  I have one, but I don't know how to use that feature.  I've always just the power on and off with any 3 phase motor and if it runs backwards swapped any two leg leads.
Since I can't find specific information on exactly what it is I have to guess that if there are other leads they would be for overheat sensor, collet closed sensor, etc.
!!!Caution!!!  Some high speed spindles caution that you can damage them by running them backwards. (and of course you can damage some kinds of pumps if run backwards.)

I'd be mounting it on the lathe in a milling attachment to do the indexed milling / drilling on large chucked work that I presently do on smaller pieces in a collet fixture on the mill.

I probably should make/finish a side milling spindle for the bigger lathe one of these days.. and some indexing discs to go on the outboard side.
--
Bob La Londe
CNC Molds N Stuff
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