Search found 6617 matches

by GlennW
Tue Mar 26, 2019 6:58 am
Forum: Milling Machines
Topic: Bearings rumble at high RPM
Replies: 3
Views: 125

Re: Bearings rumble at high RPM

I had use of a vari drie Bridgeport once and it was noisy.

Also had a friend that was one of those older guys that had been a machinist all of his life (you know the type...) and he always said that he much preferred a step pulley mill to a vari drive due to the noise.
by GlennW
Mon Mar 25, 2019 6:22 pm
Forum: The Junk Drawer
Topic: Fix my Generator
Replies: 17
Views: 191

Re: Fix my Generator

Before you store it next time: Drain the auto fuel, dump in a gallon of Avgas, run it for a couple of minutes, or of it has a fuel shut off, run it until it quits and then drain out the Avgas. The next time you need it, dump in some auto gas and it will start right up. Avgas doesn't eat things or fo...
by GlennW
Thu Mar 14, 2019 8:31 pm
Forum: General Discussion
Topic: Home made collet rack
Replies: 8
Views: 365

Re: Home made collet rack

Nice!
by GlennW
Thu Mar 14, 2019 9:29 am
Forum: Milling Machines
Topic: Need to make an accurate 8mm hole in brass plate
Replies: 18
Views: 423

Re: Need to make an accurate 8mm hole in brass plate

In the context of this thread, boring the brass plate on a lathe face plate is an option if a boring head is not available.
by GlennW
Thu Mar 14, 2019 7:46 am
Forum: Milling Machines
Topic: Need to make an accurate 8mm hole in brass plate
Replies: 18
Views: 423

Re: Need to make an accurate 8mm hole in brass plate

pete, To clarify a little, when using buttons, you usually need a more accurate measuring system to place them than is available on the machine you will be doing the final hole boring on. If your milling machine handwheels aren't accurate enough to get the accuracy needed, you would place the button...
by GlennW
Tue Mar 12, 2019 6:44 am
Forum: Milling Machines
Topic: Need to make an accurate 8mm hole in brass plate
Replies: 18
Views: 423

Re: Need to make an accurate 8mm hole in brass plate

The problem seems to be in the actual measurement of these distances where if measuring a center of an existing small hole some error is inevitable as is in the human eye when measuring. Work from the edge of the hole and know that the center will be half of the diameter from the edge. If you want ...
by GlennW
Tue Mar 12, 2019 6:34 am
Forum: General Discussion
Topic: Published Caliper Accuracy Specs (Mit)
Replies: 2
Views: 211

Re: Published Caliper Accuracy Specs (Mit)

Just more proof that the metric system is superior to the US system, :roll:
by GlennW
Mon Mar 11, 2019 12:58 pm
Forum: Milling Machines
Topic: Need to make an accurate 8mm hole in brass plate
Replies: 18
Views: 423

Re: Need to make an accurate 8mm hole in brass plate

Your best chance to make an accurate 8mm hole as far as size , roundness, straightness, and location would be to use a boring head after drilling a hole about 7mm as a start. Reamers do not cut a hole, they only size it and you would usually drill to about .015" under size and then use the reamer to...
by GlennW
Sat Mar 09, 2019 2:42 pm
Forum: General Discussion
Topic: Spinning bearings with air
Replies: 11
Views: 439

Re: Spinning bearings with air

For one thing, slide that ball bearing onto your finger and spin it up to about 10,000 rpm and have it seize.

You'll have an unpleasant experience!
by GlennW
Sat Mar 09, 2019 10:22 am
Forum: General Discussion
Topic: Rubber forming, aka Guerin process
Replies: 10
Views: 542

Re: Rubber forming, aka Guerin process

I just googles this up.

You might have already found it...

http://www.eaavideo.org/detail/video/12 ... TOTAL:DESC
by GlennW
Sat Mar 09, 2019 10:16 am
Forum: General Discussion
Topic: Rubber forming, aka Guerin process
Replies: 10
Views: 542

Re: Rubber forming, aka Guerin process

If you use the box you can use cut up inner tubes to fill it as they will conform to just about anything and give more even pressure on the form.
by GlennW
Fri Mar 08, 2019 6:31 pm
Forum: General Discussion
Topic: Rubber forming, aka Guerin process
Replies: 10
Views: 542

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 ...