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Old 09-12-2013, 12:07 AM   #441 (permalink)
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Yep, still had no control in the full position. Going to bring it into work tomorrow and play stump the Electrical Engineers.
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Old 09-12-2013, 12:16 AM   #442 (permalink)
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try another motor on the speed controler.
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Old 09-12-2013, 11:26 AM   #443 (permalink)
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That sounds odd... I don't know that much about electronics but even I know thats out of place :s

So I was talking to my father-in-law (who's a red seal millright and has welding, plumbing, carpentry, machining, and electrical tickets and about 30 years field expieriance) and started telling him about how in a few years I want to have a shop and would like to have a 3-phase power source. He told me all about the local power companys rules on it so I asked about RPC's and he told me that he used to make them for plants using 3-phase motors and he knows where to get a sizeable motor for cheap and if I want we can build one together so my question is how is this done because I dont want to sound like a complete idiot
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Old 09-12-2013, 01:03 PM   #444 (permalink)
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Don't ask us, ask him. Sounds like a cool project to do together.
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Old 09-12-2013, 01:42 PM   #445 (permalink)
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try another motor on the speed controler.
Even better. I brought it to one of the EE's in the office and he said it's all the controller's fault. We found a honkin' variable transformer and it did just what it should. My buddy was finished with his speed controller, so we tested on that (and it works) so he just gave it to me.

It may be a little lathe, but it's my little lathe, and tonight, it will be put back together.
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Old 09-16-2013, 05:08 PM   #446 (permalink)
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I have a question for the group. I have the chance to get a full sized lathe at a decent price. It's a gearhead, which is nice, but only issue is that the lowest RPM is 150. I am anticipating to do some single point threading on this lathe.

Is this RPM low enough?

I read a thread on a forum somewhere about this and a few people chimed in and said low to mid 100's was a fairly common lowest RPM in Europe and that people who are used to 60's get used to it.
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Old 09-16-2013, 05:25 PM   #447 (permalink)
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When I do my single point threading on my lathe I usually thread at 90 rpm. You could do it at 150 but you just have to pay more attention because for a coarse thread it will be pretty fast.
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Old 09-16-2013, 05:32 PM   #448 (permalink)
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Can you disconnect the motor? Like a neutral gear or the like. My little lathe had this problem where you could not get enough torque at low speeds so I would just disconnect the motor and I used a hand crank to turn the spindle. I know its slow but you can stop the threads EXACTLY where you want. Its nice also for ID threads when you cant see what your doing.

My concern would be cutting off that might be a bit high for something like 316
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Old 09-16-2013, 05:39 PM   #449 (permalink)
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Not likely to do many course threads. Even then, I could probably build in enough relief. I was doing some work on a machine here at work (on an off day, can only do this every other Friday) and at 12 TPI at ~60 RPM I was hitting a .005 window on the DRO on every pass when I took off the half nut.

EDIT: I was looking at 9 x 20's for a little while. They have a low RPM of 120, so a hand crank was brought up a few times. I don't think that is an option on this lathe, but not positive.

This lathe is a 12 x 40.
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Last edited by desertT1; 09-16-2013 at 05:46 PM.
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Old 09-16-2013, 06:11 PM   #450 (permalink)
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A future note to all airsmith/machinists... Tippmann 98 threads are a pain in the butt to make.

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