Search found 132 matches

by johnfreese
Thu Jan 31, 2019 6:43 pm
Forum: General Discussion
Topic: Rotary Broach holder
Replies: 17
Views: 784

Re: Rotary Broach holder

Rotary broaches usually have the center of rotation 1* offset from the spindle centerline. Tools typically have a 2* per side clearance.

No need to buy the cutters. You can make them from drill rod. Having a tool & cutter grinder makes the job a lot easier.
by johnfreese
Wed Jan 30, 2019 7:41 pm
Forum: General Discussion
Topic: Rotary Broach holder
Replies: 17
Views: 784

Re: Rotary Broach holder

I have a dwg drawing and Solidworks models & drawings for a rotary broach with radial and thrust bearings. Send me a PM with your e-mail address if you want copies. I will try to get as many e-mails out before Friday evening. Requests later than that will be answered in about 3 weeks. eDrawings view...
by johnfreese
Sat Jan 26, 2019 10:25 pm
Forum: General Discussion
Topic: Threading with a tap
Replies: 6
Views: 509

Re: Threading with a tap

I favor spiral point taps for through holes and spiral flute taps for blind holes. Both have cutting rake angles that are much more favorable than conventional hand taps. Neither requires backing up to break chips. Actually backing up is undesirable with these taps.
by johnfreese
Thu Jan 24, 2019 9:19 pm
Forum: General Discussion
Topic: Large pan for evaporust-ing
Replies: 7
Views: 714

Re: Large pan for evaporust-ing

Nail up a wooden box. Line it with plastic sheet.
by johnfreese
Sun Jan 20, 2019 12:24 am
Forum: General Discussion
Topic: Cutting plastic
Replies: 19
Views: 1306

Re: Cutting plastic

I second the idea of sawing the discs, drilling, stacking for turning.

I hate turning plastic. I spent almost as much time untangling swarf as I did turning the parts.
by johnfreese
Tue Jan 15, 2019 1:45 pm
Forum: Lathes
Topic: What Size Quick Change for Enco 13 x 40?
Replies: 25
Views: 3976

Re: What Size Quick Change for Enco 13 x 40?

As WLW posted, he had to put a riser under the toolpost to get the right center height. The toolpost was too small for the lathe. Conversely if you buy a toolpost too large for the lathe the it may not be possible get the toolholder low enough to put the tool at the right center height.
by johnfreese
Tue Jan 15, 2019 1:23 pm
Forum: General Discussion
Topic: Bandsaw tires
Replies: 25
Views: 1275

Re: Bandsaw tires

I replaced the tires on a 24" Grob saw. They were Urethane. I just needed to warm them up a bit and stretch them over the wheels. Since your saw has no raised rims you are going to have to cement the tires in place. You might check this site and see if they can offer advice. https://www.carterproduc...
by johnfreese
Tue Jan 15, 2019 8:11 am
Forum: General Discussion
Topic: Holes with interrupted cuts / offset holes, how to cut?
Replies: 17
Views: 1305

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

I would drill the holes undersize and follow with an end mill to guarantee the finished hole did not drift. For the counterbore I probably don't have the correct size endmill so I would check my stock of counterbores. If none of them were the right size I would use a boring head.
by johnfreese
Tue Jan 15, 2019 8:02 am
Forum: Lathes
Topic: What Size Quick Change for Enco 13 x 40?
Replies: 25
Views: 3976

Re: What Size Quick Change for Enco 13 x 40?

I had a BXA on mu 13 x 30 Clausing Metosa. It worked fine. I have a Nardini 16 x 40 (actually most components are the same as their 14 x 40) I am using BXA on that.
by johnfreese
Sat Jan 05, 2019 9:13 pm
Forum: Live Steam
Topic: Welding Machine
Replies: 37
Views: 2762

Re: Welding Machine

The Airco industrial welders were well made. As a 300A , 125% duty cycle machine it is unlikely the previous owner overheated it unless he was doing seriously heavy fabricating. One suggestion: check the availability of replacement diodes. It is capable of burning a 3/16 E7024 electrode although you...
by johnfreese
Sat Jan 05, 2019 9:03 pm
Forum: General Discussion
Topic: Torque and it's relation to tramming a mill head
Replies: 14
Views: 1214

Re: Torque and it's relation to tramming a mill head

I don't know what torque value one is supposed to use. I assumed a strong pull on the wrench that came with the machine was about right. In regard to tramming the nod direction I use a long precision parallel on the table. I set up the indicator so it will be approximately directly under the nod piv...
by johnfreese
Fri Jan 04, 2019 7:10 pm
Forum: General Discussion
Topic: Mill tramming device
Replies: 30
Views: 2142

Re: Mill tramming device

Mr Ron, that only works for drilling or boring, or squaring the end of a part. If the spindle is not square with the table facing cuts made with an endmill, face mill, or fly cutter will not be flat. Each pass will result in a shallow scallop. Tramming the head isn't hard. You would need to do it on...