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Thread: Chipmaster Thread Cutting
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10th August 2013, 12:19 AM #16Senior Member
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That's Better
I am batching it this weekend (with 3 kids...) so I was able to slip out to the shed once they were all in bed and have another go at thread cutting.
this time I did not disengage the half nuts, used a smaller depth of cut and mixed up some cutting fluid to use.
the results where much better. I still have a bit of work to do to improve the surface finish of the thread (any pointers appreciated)but not to bad for my second attempt.
Thanks to everyone who posted replies and to Phil Steamwhisperer for his assistance.
Cheers
Piers
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10th August 2013 12:19 AM # ADSGoogle Adsense Advertisement
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10th August 2013, 12:24 AM #17
Looks good Piers!
It looks like you got a little chatter on the last few cuts. I find once chatter starts when threading there is not much you can do, except ensure you cut on on the leading edge only. I'd say you took just a bit too much off with both edges. What speed did you use?
Cheers,
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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10th August 2013, 12:34 AM #18Member
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My father used to buy up the threaded dies from the coventry die heads used on automatic lathes. We used to braze them on to bars to make multi point cutting tools. Excellent on fine threads like that.
I always found flooding the job with cutting fluid produced best results with thread cutting too.
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10th August 2013, 12:38 AM #19
getting there
Looking 100% better Piers .
If I stuff up a thread job on the lathe . If I can, I usually turn it down and then shrink a sleeve onto the part, then turn to size and re-cut the thread Mike
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10th August 2013, 12:41 AM #20Senior Member
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Ew,
Not sure of the speed as I have a DC motor with a variac, but I am pretty sure I was running slower than you where in your video. What is better?
I think you are right about taking too deep a cut on both sides on the last pass. I was only trying to take a thou plunge but it did bog down a bit and not make nice clean spiral chips like it had on all the other passes.
Cheers
Piers
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10th August 2013, 12:49 AM #21
You need a Tacho! (i'll tac a link on) I take it your machine is variator free?
I generally thread at 250-300 RPM, depends if i'm threading to a shoulder or not. I was threading M18x1.5 tonight at 250, to a shoulder. I think I've pushed it to 400 on small stuff, but the reflexes have to be good, especially since i always leave the nuts engaged. You have a mechanical brake on the Chippie though don't you? Plus your DC should stop pretty quick. Next time i think of it i'll do a vid of threading without moving the compound from 0.
Cheers,
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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10th August 2013, 12:59 AM #22
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10th August 2013, 01:05 AM #23Senior Member
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10th August 2013, 01:08 AM #24
Not that fast, the lathe stops pretty quick at those speeds. I like my VFD. You get used to how much thread the lathe will cut coasting.
Here is the link to tacho info Piers, there is 11 pages in all, but we got there in the end. https://www.woodworkforums.com/f65/wo...erence-157501/
Cheers,
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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10th August 2013, 01:08 AM #25Senior Member
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