Search found 184 matches

by johnfreese
Tue Mar 10, 2020 10:48 am
Forum: General Discussion
Topic: Turning small diameters, right/wrong way
Replies: 17
Views: 2082

Re: Turning small diameters, right/wrong way

If the part were turned between centers it would not matter what sequence of cuts were taken. If the part is supported in the chuck only then the sequence should be smallest diameter first, then the successively larger diameters.
by johnfreese
Sun Mar 01, 2020 5:23 pm
Forum: Live Steam
Topic: Reaming vs. Drilling Holes In Tube Sheets
Replies: 38
Views: 10231

Re: Reaming vs. Drilling Holes In Tube Sheets

Using a twist drill to make holes in thin materials usually results in a 3 lobed hole. Step bits cut a perfectly round hole. Blair and Hougen sell multi tooth hole cutters. To get the correct clearance needed for the tubing being used may require the hole be cut undersized and reamed to diameter.
by johnfreese
Sun Mar 01, 2020 5:07 pm
Forum: General Discussion
Topic: Dead soft Aluminum
Replies: 14
Views: 1500

Re: Dead soft Aluminum

Check out the aluminum sheet in the hobby metals of a home improvement store. I think you will find it soft.
by johnfreese
Sun Feb 23, 2020 10:02 pm
Forum: General Discussion
Topic: hardening and tempering
Replies: 20
Views: 2359

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: 1540

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: 2093

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: 3615

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: 2885

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: 27
Views: 5541

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: 2952

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: 2885

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: 2869

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.