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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Thread Cutting
Hello,
First of all, I have an Acra (now Enco?) 9x20 Chinese bench lathe. This lathe was given to me by a friend a few weeks ago and it didn't get much use at all from him. For some reason the thread cutting system seems way off. When I cut one pass (say 16tpi) and measure the light cut with my thread guage, I'm getting closer to a 17tpi cut. When I try to do a 26 tpi pass I get closer to a 28tpi cut. I've checked and rechecked all of the gear combinations listed on the chart and the are correct. Additionally, when I try to use the thread chasing dial, I can never get the same cutting pass. For example, I'll use strictly the number 1 on the dial and my second cutting pass will be right in between the first cutting pass. I'll try it for a third pass and I'll get a whole different cutting pass. This is really frusterating! Has anybody ever heard of this before? I was actually impressed with the quality of this Chinese manufacturing, but now I'm beginning to wonder... If pictures would help at all I'd be glad to take a few and post them. Thank you very much, Carter |
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