Search found 6653 matches

by GlennW
Fri Mar 08, 2019 6:31 pm
Forum: General Discussion
Topic: Rubber forming, aka Guerin process
Replies: 15
Views: 3331

Re: Rubber forming, aka Guerin process

I've done quite a few parts using 1" thick Buna-N 70 durometer sheet on the bed of a 50 ton press. There are a number of techniques depending on the size and shape of the parts. I used to run a press brake using 2" square polyurethane bar for a lower die and just push the upper die into it. It made ...
by GlennW
Wed Mar 06, 2019 6:27 pm
Forum: Home Shop CNC
Topic: Thread Milling
Replies: 30
Views: 7581

Re: Thread Milling

I'm liking thread milling a lot for stainless 1/8 NTP.
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The next time I'm tinkering with it I'll shorten it up a thread or two and adjust the diameter accordingly.
by GlennW
Tue Mar 05, 2019 4:17 pm
Forum: General Discussion
Topic: "Mounting a square piece between centers
Replies: 18
Views: 2342

Re: "Mounting a square piece between centers

Did you notice the tool is upside down and I am running the spindle in reverse? I went to grind the tool and got interrupted, when I went back to it my brain cell failed and I ground the form tool backwards. :oops: Too lazy to grind another one so I just flipped it over. It made the chips fall strai...
by GlennW
Tue Mar 05, 2019 7:36 am
Forum: General Discussion
Topic: "Mounting a square piece between centers
Replies: 18
Views: 2342

Re: "Mounting a square piece between centers

I was going from 1/2 square to .390" round in one pass, then a finish pass to .375". The first twenty pieces went smoothly with zero chatter and the twenty first piece started to chatter so badly on the roughing pass the machine started to shudder. It turned out that the edge had chipped on the HSS ...
by GlennW
Mon Mar 04, 2019 7:46 pm
Forum: General Discussion
Topic: "Mounting a square piece between centers
Replies: 18
Views: 2342

Re: "Mounting a square piece between centers

I just did a similar job and cheated. I used a square collet.

1/2" square 8 1/2" long turned down to 3/8".
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I do this stuff to remind myself that I don't like doing this stuff...
by GlennW
Tue Feb 19, 2019 2:19 pm
Forum: General Discussion
Topic: Softjaw question
Replies: 15
Views: 2348

Re: Softjaw question

I'm a bit OCD sometimes when using thin wall stock, so I bore a piece of scrap, measure the bore, and then use the dial or DRO to go from there to the size I want the jaws bored to.
by GlennW
Mon Feb 18, 2019 4:25 pm
Forum: General Discussion
Topic: Suggestions for cutting fluids
Replies: 3
Views: 1142

Re: Suggestions for cutting fluids

If you are working with steel, just try running the carbide end mill dry and just keep it moving. Don't let it sit there and rub without making decent chips.
by GlennW
Wed Feb 13, 2019 9:53 pm
Forum: The Junk Drawer
Topic: steamin10 (Big Dave)
Replies: 47
Views: 8817

Re: steamin10 (Big Dave)

This is truly sad news.
by GlennW
Fri Feb 08, 2019 12:41 pm
Forum: General Discussion
Topic: Counterbore tips needed
Replies: 3
Views: 961

Re: Counterbore tips needed

EOsteam wrote:
Fri Feb 08, 2019 11:39 am
Should I use a #26 drill for the clearance portion of the hole and then follow w/ the counterbore?
That would depend on the size of the pilot on the counterbore as not all are the same size.

Match the drill size to the pilot size and put a drop of lube on the pilot.
by GlennW
Fri Jan 25, 2019 8:04 am
Forum: General Discussion
Topic: Threading with a tap
Replies: 6
Views: 1107

Re: Threading with a tap

It sounds like you are using fairly dull hardware store grade carbon steel taps.

I believe that a new HSS tap and some tapping fluid would make a huge difference in your results.
by GlennW
Sat Jan 19, 2019 9:26 pm
Forum: General Discussion
Topic: Leveling feet ?
Replies: 19
Views: 2769

Re: Leveling feet ?

If you will have 2 3/8 of stud sticking out, why not just leave the legs a bit longer?
by GlennW
Mon Jan 14, 2019 10:03 pm
Forum: General Discussion
Topic: Holes with interrupted cuts / offset holes, how to cut?
Replies: 17
Views: 2483

Re: Holes with interrupted cuts / offset holes, how to cut?

Don't neglect to consider the sharp corner that an annular cutter would leave at the base of the bore if used in the context of this thread.

A boring bar can be ground to leave a suitable radius to help eliminate stress risers.