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+--- Thread: Brainstorming (/thread-4054.html)
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RE: Brainstorming - Doc55 - 07-20-2019
I had been in the machining trade for 43 years (now retired) if you use the proper speeds and feeds the heat will be in the chip and not the tool or the part being machined. So take the sfm and sit down and figure out the proper rpm and feed and you will be surprised as the heat will no longer be in the tool or part but be in the chip. And always keep the chips clear of the cutter as they are now harder than the part being machined and will dull your cutter. I have seen this so often in the shop the operator will slow down the feed and not the rpm to try and get a better finish only to heat up and dull his or her cutter. The get a better finish you don't change the rpm or feed but increase the corner radius on the cutter but with that you increase cutting pressure so you do need a solid setup and a solid spindle to handle the increase.
RE: Brainstorming - pepi - 07-25-2019
(07-20-2019, 09:53 AM)Doc55 Wrote: I had been in the machining trade for 43 years (now retired) if you use the proper speeds and feeds the heat will be in the chip and not the tool or the part being machined. So take the sfm and sit down and figure out the proper rpm and feed and you will be surprised as the heat will no longer be in the tool or part but be in the chip. And always keep the chips clear of the cutter as they are now harder than the part being machined and will dull your cutter. I have seen this so often in the shop the operator will slow down the feed and not the rpm to try and get a better finish only to heat up and dull his or her cutter. The get a better finish you don't change the rpm or feed but increase the corner radius on the cutter but with that you increase cutting pressure so you do need a solid setup and a solid spindle to handle the increase.
I can see that, and think that is part of my problem with the finish using the inserts, and being a boot.
Well I am ready for some HSS tool grinding .... or profiling, must be one or the other LOL Actually looking forward to doing some, was apprehensive at first. Have a much better understanding of how to get there.
[attachment=16291]
I was going to buy wheels and mount them on a 6in grinder. I use for truing things like cut bolt threads. Seeing the price of the white alum oxide wheels. Having to use plastic bushings for the proper shaft to wheel fit. The trying to smooth radial and lateral run-out .... yes I have a lathe and could make them.
Time + cost ........... ?
Stumbled on an 8in with 60 - 120 grit wheels 100 bucks... I'll take it
https://www.rikontools.com/product/80-805
Pep
RE: Brainstorming - Dr Stan - 08-25-2019
For your best results use a diamond dresser that also trues up the grinding wheel. My favorite is the Geiger Wheel Dresser that I bought from Travers Tool. Just go to their web site and search for it by name. BTW, no connection to either Travers or Geiger.