Search found 181 matches

by johnfreese
Sun Feb 23, 2020 10:02 pm
Forum: General Discussion
Topic: hardening and tempering
Replies: 19
Views: 584

Re: hardening and tempering

To get a rapid quench in water the water must be agitated or the part moved rapidly through the quench. If the part is held still and the quench is not agitate a layer of steam will form around the part which acts as an insulator.
by johnfreese
Fri Feb 14, 2020 3:10 pm
Forum: General Discussion
Topic: How To Remove Threaded End Of Broken Pipe?
Replies: 8
Views: 804

Re: How To Remove Threaded End Of Broken Pipe?

I have removed a lot of broken pipe stubs using a hacksaw blade. Make 3 or 4 slits inside the pipe stub. Go deep enough to see the beginning of threads. Using a pointed punch, applied next to a slit,collapse the pipe stub. After that you should be able to back out the stub with needle nose pliers.
by johnfreese
Fri Feb 14, 2020 2:27 pm
Forum: General Discussion
Topic: Good price for 1144 round at Fastenal
Replies: 13
Views: 812

Re: Good price for 1144 round at Fastenal

Last fall I went to the local Fastenal store. They had a sign static that they would only sell to business accounts.
by johnfreese
Tue Jan 14, 2020 5:52 pm
Forum: General Discussion
Topic: Keeping drilled holes aligned
Replies: 38
Views: 2791

Re: Keeping drilled holes aligned

I would mount my drill in my ER16 straight shank holder. I would hold the drill as short as possible and still have enough stickout to get through the metal. A split point or 4 facet grind will not tend to walk off location. Using a carbide drill with this kind of setup would be like wearing a belt ...
by johnfreese
Thu Jan 09, 2020 9:01 pm
Forum: Lathes
Topic: "Put it in 'R' for Race"
Replies: 12
Views: 1983

Re: "Put it in 'R' for Race"

My current lathe is a Nardini. Both the headstock and the apron have cam-driven piston pumps. I get reliable oiling regardless of direction of rotation.
by johnfreese
Sun Jan 05, 2020 7:06 pm
Forum: Live Steam
Topic: Free 2D CAD Software?
Replies: 26
Views: 3652

Re: Free 2D CAD Software?

Solid Edge ST8
by johnfreese
Sat Jan 04, 2020 9:30 pm
Forum: General Discussion
Topic: Floating reamer holders
Replies: 21
Views: 2408

Re: Floating reamer holders

Floating reamer holders sometimes show up on eBay. Look for Glenzer or Scully Jones brand. They are built to allow only radial float. If your tailstock does not feed perfectly parallel with the spindle you will get a bell mouth hole with or without a floating holder. As lathes wear the front of the ...
by johnfreese
Sun Dec 29, 2019 9:29 pm
Forum: Lathes
Topic: "Put it in 'R' for Race"
Replies: 12
Views: 1983

Re: "Put it in 'R' for Race"

I had a 40s vintage Pratt & Whitney 14" lathe. There was no provision for reversing the spindle. It would have been possible to install a reversing switch on the motor. If the machine were run in reverse the lube oil pump would not provide oil to the gears and bearings.
by johnfreese
Sun Dec 29, 2019 9:20 pm
Forum: General Discussion
Topic: Ball end mills
Replies: 17
Views: 2444

Re: Ball end mills

Remember with the mill spindle vertical there is zero fpm on the centerline of the cutter. As others suggested tilt the spindle to shift the cutting area away from dead center.
by johnfreese
Sun Dec 29, 2019 9:14 pm
Forum: General Discussion
Topic: Floating reamer holders
Replies: 21
Views: 2408

Re: Floating reamer holders

Look for a used Glenzer or Scully Jones floating holder. I got mine on the Bay.
by johnfreese
Sun Dec 29, 2019 9:09 pm
Forum: General Discussion
Topic: How to make small duplicate pieces?
Replies: 9
Views: 1183

Re: How to make small duplicate pieces?

I would hold it in a square 5C in a collet block or indexer.. Use a collet stop to hold length. First do the radius on the end, 2 cuts with a corner rounding cutter. Second square the opposite end to get the OA length. Third, use a slitting saw on the square end. Fourth use a slitting saw on the rou...
by johnfreese
Sat Dec 21, 2019 5:55 pm
Forum: Gunsmithing
Topic: Floating Reamer Holder.
Replies: 2
Views: 633

Re: Floating Reamer Holder.

You can often find used Glenzer or Scully Jones floating holders on the Bay. Both offer radial float but no angular float. A no.2 taper tap driver for a 1/8" pipe tap will drive the reamer. Instead of grinding the flats on the reamer to fit the square in the tap driver I just grip the reamer on the ...