- Thread starter Kram
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Windy Miller
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Do you have a link for that?
I need to get some new boring bars. My little 8mm one is just too springy.
Hood
I am obsessed.
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Started on another roller today, turned a 45mm dia hole into two bits of 250mm dia x 16mm thick 316. Turned down two bits of 50mm dia 316 to 45mm for the first 16mm, pressed them in into the plates then welded. Tomorrow I will turn down the OD of the plate to 119mm and then a step of 8mm to 112mm and press it into some 8" NB Sch10 pipe and weld it up.
I think I have the same bars but don't think I have got any tips for them yet. Lol
Kram
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Yes but for boring steel its important the inserts work well, I found it difficult to get good ones to suit boring and the ones above were luck.
I have a spare one I rarely use - the DCMT inserts I have dont work particually well at the different angle it uses. I'll get a photo if your interested, its a Korloy C08K-SDQCR-07.
The good ones above are SDUCR which is excellent with that style of single edge chip breaker. The APT inserts are not available anymore tho I have a few spare if you do get a SDUCR I can send a few, they last a long time.
I have one of these, min bore about 10mm. cCMT inserts
However the 8mm is probably same min bore so get that instead
Or SDUCR07 /11 like my ones above.
Remarkable coincidence you just posted these.
I may wish to enlarge/destroy a 16mm threaded hole to say 18 or 20mm. Very hard steel. Carbide would do it. Have you seen the price of solid carbide end mills or drills
Would one of these be up to the job?
Kram
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You dont need a carbide bar just any insert bar with a carbide tip unless its very deep, but yes they will.
12mm has a min bore of 16mm.
Carbide bars advantage is the rigidity. My 20mm bar in the pic above I can use at full stickout with little increase in vibration...
12mm has a min bore of 16mm.
Carbide bars advantage is the rigidity. My 20mm bar in the pic above I can use at full stickout with little increase in vibration...
Johnnybravo
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Machining Thin wall tubes again. 1,78mm od, 1,7mm Id. 8,5mm long out the shytest grade of mild steel available, 1010. Now to drill four rows of 5 holes around the circumference.Then I need to nickel plate them as no plating shop has the balls to plate them, let alone make them
Seadog
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Ah, that makes more sense than your Insta post
Johnnybravo
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A prototype part ,so unfortunately not at liberty to say. I need to make five of them.
iNf
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Johnnybravo
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oldbikedavey
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Oi ! That's Essexist !
Johnnybravo
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Don’t worry, if you dig deep enough in that swarf tray, you probably can find the remnants of Moses who died trying to part the Sea of abysmal shavings, he never made it to Essex…
Windy Miller
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Hmmm there’s a lot more to this than I’d imagined! Shame that the postage costs are nearly the same as the cost of the tool. More investigation required!
oldbikedavey
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Rumour is that Jesus may have travelled to this benighted shore, along with Joseph of Arimathea...
It'll all have been greatly downhill since, though...
Windy Miller
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So how on earth do you actually make these things? I can understand the 1.7mm hole, but how do you machine to a wall thickness of 0.04mm? That’s just crazy!
Johnnybravo
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Witchcraft….I used to laser weld them together from foil but found it’s a lot easier to machine them from solid.
Dr.Al
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Reminds me of the line about the song "Jurasalem" - it begins with a series of questions, the answer to each of which is "no"
