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Thread: Boring bar threading?
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24th Feb 2020, 05:38 PM #1Senior Member
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- Feb 2012
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Boring bar threading?
As a complete beginner when it comes to insert tooling I have what I think will be a silly question! I have a very nice little boring bar and I wonder if I can use a 60deg threading insert mounted on the bar for external thread cutting? My chuck is held on by studs and I would like to try threading in reverse away from the head stock like I know several members here have done. I have attached some pics on the boring bar I have - is there a way to use it as a threading tool as well or is it only to be used for internal boring?
etched on the tool are the following - SR34-514 WX**0403 A10K-SWLXR04-D120
if I can’t use this one is there a preferred threading insert holder and inserts anyone can recommend?
FA90ADAE-F14F-45EE-95B8-3753A46CB783.jpegB9DCFE55-7297-4CED-B641-A3EDF1F9F090.jpeg
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24th Feb 2020, 05:49 PM #2Most Valued Member
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Hi there,
I have a couple of threading insert holders (inside & external threading) and both 55 and 60 degree indexed threading inserts.
I got them from eBay for probably $20 each. They work pretty good. I now only use hss for threading to a tight shoulder etc.
Im not sure if the threading inserts will fit that boring bar but for the price of 1 boring and couple of inserts, just buy one!
Simon
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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24th Feb 2020, 06:06 PM #3Gear expert in training
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Short answer: No.
The main reason being that your boring bar does not take actually triangular inserts (which is the shape of threading inserts), but what's called a Trigon shape; which has an included angle of 80 degrees, not 60. Triangular inserts will not seat properly.
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24th Feb 2020, 06:57 PM #4Most Valued Member
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I think the tool holder you need for reverse external threading of RH threads is a SEL tool holder, and IR inserts, eg SEL1212H16 and 16IR AG60 inserts.
The 16IR will cut metric 0.5-3.0mm pitches.
Steve
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24th Feb 2020, 07:12 PM #5Senior Member
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- Feb 2012
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Thank you everyone - that has really cleared it up for me. I’ll go and see what I can grab on eBay.
Ian
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24th Feb 2020, 07:28 PM #6Most Valued Member
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I like your thinking.
I know i try and i wish you could use 1 tool for every thing.
imagine that. Use your toaster to paint your walls,jump start your car as well as shave...
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24th Feb 2020, 08:37 PM #7
Hi Ian, Guys,
18-09-2018-2.JPG
This is the shape of the boring bar and insert. You can get very close to the work with these. That tip point is about a MM away from the flat surface. I'm about to cut the thread for the elephants foot for a dial gauge.Best Regards:
Baron J.
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24th Feb 2020, 08:52 PM #8Senior Member
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Thanks Baron
Looks exactly like what I am after. Does this use the inserts Steve mention in his post above?
Ian
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24th Feb 2020, 09:33 PM #9
Hi Ian,
Yes it does ! I have both 55 and 60 degree inserts for mine. It came from "Banggood" very cheap, about £6 or £7 UK post free, complete with 3 inserts.
I also bought a bar that holds the same inserts but is intended to go straight in like a normal lathe tool.Best Regards:
Baron J.
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