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Thread: Diamond shaped insert tools
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3rd May 2011, 07:34 PM #16.
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Rather frustratingly I was just at the "I'll give it just one more turn" of the tapping stage, when one of my "amazing value" Indian taps snapped off.
I'd say a deserved result! Sub continental shopping Come on Pete..
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3rd May 2011, 07:49 PM #17Most Valued Member
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Actually the rest have been remarkably good Bob, especially considering the pittance they cost, nobody was more surprised than me. This was actually a 1/4" and some of the smaller taps stood up to much higher torque that this one. I only bought them with the intention of using them to clean up threads but you know how it is. Normally taps and cutters are things I never skimp on. Never mind. Won't take long to whip up a new one as the mill is still set up for slotting.
Pete
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3rd May 2011, 10:17 PM #18Most Valued Member
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Bob the holder is as per the link earlier, and the inserts are Lamina DCMT 11T304 NN. I didn't buy a whole packet until I saw how they performed, so have the one in the holder plus two spares.
http://www.lamina-tech.ch/img/catalog/503.pdf
BTW re the sub-continent quality, I was just drilling some pilot holes in thick steel plate and snapped a Sutton drill so there you go; looks like we can all have "one of those days"
Pete
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3rd May 2011, 11:01 PM #19.
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I will admit to being in agreeance there Pete. I had been using an M8 Sutton die on some manly 4140. It was a split die and when I nipped it up a touch to slightly reduce the thread diameter, it did nothing. It would not cut a whisker off the previously cut thread.
I went to Alltools, a nearby tool seller, and tried to buy a new Goliath die. I was told they were buy in items and would cost twice that of the Sutton. Bought a new Sutton die to finish the job, the adjuster for the mill table. Came home and purchased a English Totem die from a seller in Denmark. Multiculturalism.
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3rd May 2011, 11:10 PM #20Most Valued Member
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Oh gawd don't mention M8 to me. I'm having one of those days today. I drilled the tapping hole for the M8 I planned to use for a job. No particular reason to use M8, just seemed a good size. I then went to grab the tap ... scratch scratch scratch, no tap! No idea why it's not there. Too late to go smaller, not really enough room to go bigger. Fortunately I had a cheap M8 in a metric set I bought years ago. It cut terribly and I was cringing the whole time just waiting for that familiar "crack" and let's make it TWO broken taps and a drill bit it one day. I don't think I've ever backed off a tap so many times in my life, it took forever
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4th May 2011, 12:44 PM #21Senior Member
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4th May 2011, 12:58 PM #22.
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OF,
Any chance of letting me know what make, grade and shape insert you use?
The inserts I have been using are Kennametal KC5025 CCGT.
BT
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4th May 2011, 02:05 PM #23.
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OF,
The photo attached is indicative of the finish I have been getting. This is 1045. This would have been a light cut. You will notice how it looks " torn ".
BT
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4th May 2011, 02:26 PM #24Most Valued Member
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Bob have you tried higher speeds? Also try rotating or a new insert for a fresh edge.
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4th May 2011, 02:35 PM #25.
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Pete,
That was turned pre the 2600rpm pulley setup. It would have been 700 rpm.
Have you tried your inserts on something toughish? How about a high tensile bolt if you haven't got a piece of chrome moly laying around.
BT
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4th May 2011, 02:58 PM #26Most Valued Member
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What was the surface speed at 700 rpm Bob? That sounds way too slow to me but I may have the size perspective wrong in the photo.
No I haven't had a chance to try it on anything tough as yet. I've been pretty busy today just making up a jig for my QCTP to take my Proxxon drill. I need to powdercoat it when I get back later today, then maybe I can try the insert on other materials.
Pete
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4th May 2011, 03:00 PM #27
Hi Bob,
Have a look at this thread I think that covers some of the issues.
http://www.woodworkforums.com/f65/fi...us-doc-131110/
The quick summary, is that, for light cuts, I got better finish by reducing the nose radius of the insert. (opposite to what I would have initially thought) Took a few goes on the diamond wheel to figure out what worked.
What you are seeing on annealed 1045 looks similar to what I was seeing on mild.
Regards
Ray
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4th May 2011, 03:11 PM #28.
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Maybe about 230sfm, Pete. The body of the slotter crankshaft pictured is about 32mm in diameter.
Do you have your own powder coating facilities? Tell more.
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4th May 2011, 03:23 PM #29Most Valued Member
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Bob, racing out for a ride (not raining here in Sydney for once ... hey come to think of it, when I was over there the other day it was p%%ing down), so will give you all the details when I get back. But yes, powder coating is terrific, just need to build a bigger oven.
Here are a couple of pics I could quickly find of powder coated parts
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4th May 2011, 04:05 PM #30.
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