Search found 17754 matches

by Harold_V
Mon May 11, 2020 1:17 am
Forum: Buy, Sell, Trade, Wanted, Free!
Topic: Atlas X-Y Rotary table
Replies: 7
Views: 476

Re: Atlas X-Y Rotary table

Please correct me if I'm wrong, but that doesn't look like a rotary table. Just an X-Y table, and unable to make rotary cuts.

H
by Harold_V
Mon May 11, 2020 1:13 am
Forum: Gunsmithing
Topic: Cartridge holder for lathe
Replies: 4
Views: 478

Re: Cartridge holder for lathe

Case trimming is generally accomplished by holding the cartridge in a sleeve, which presents the cartridge end to the cutter at the proper attitude. If one has a stop in the back of the chuck (or better yet, soft jaws with a shoulder), the setup you described could be a solution to trimming, althoug...
by Harold_V
Sun May 10, 2020 1:30 am
Forum: Lathes
Topic: Radius Knurling.
Replies: 20
Views: 1203

Re: Radius Knurling.

Taps also have no back relief. I've always wondered if they would work better if they did, but cutting them would be hellish, I would think. Dave Yes, that's true, and I thank you for the comment, as I didn't even think of them when I posted. Taps, like drills and reamers, are most likely tapered s...
by Harold_V
Sat May 09, 2020 4:06 pm
Forum: Lathes
Topic: Radius Knurling.
Replies: 20
Views: 1203

Re: Radius Knurling.

What whatego said, and you can see the results of that in the less than good finish in the milling cuts. A circular cutter should be fully relieved in order for the tool to cut properly (think of how a countersink works). The only cutting tools I can think of that violate that rule would be drills a...
by Harold_V
Sat May 09, 2020 3:55 pm
Forum: Lathes
Topic: Repowering SB 9" Lathe
Replies: 19
Views: 1146

Re: Repowering SB 9" Lathe

No reason a single phase should hunt more than a 3 phase under a steady load..unless is a crappy motor to begin with. I'm not sure that's true, Bill. Single phase motors don't have the overlap of power pulses that are enjoyed by three phase. The average voltage remains much higher with three phase ...
by Harold_V
Sat May 09, 2020 2:00 am
Forum: Lathes
Topic: Repowering SB 9" Lathe
Replies: 19
Views: 1146

Re: Repowering SB 9" Lathe

I don't see the single phase motor, even a rough one, being of any consequence. What Bill alludes to is quite true when you're going for fine finishes and close tolerance, though. That's especially true for precision grinders, where a single phase motor is likely to show in the finish, no matter wha...
by Harold_V
Sat May 09, 2020 1:55 am
Forum: Build Log
Topic: Converting a Baldwin 2-4-2 LYN to a Baldwin 2-4-4
Replies: 685
Views: 143388

Re: Converting a Baldwin 2-4-2 LYN to a Baldwin 2-4-4

Wow! Very nice, Charlie.

H
by Harold_V
Sat May 09, 2020 1:46 am
Forum: Lathes
Topic: Radius Knurling.
Replies: 20
Views: 1203

Re: Radius Knurling.

He'd have enjoyed much better success with his cutting tool had he relieved it properly. Otherwise it's quite informative and should provide guidance for folks who would like to produce custom knurls. His trick with soft wire to hold boric acid while heat treating is exceptional. Thanks for posting. H
by Harold_V
Sat May 09, 2020 1:27 am
Forum: General Discussion
Topic: 4-way toolpost build
Replies: 13
Views: 924

Re: 4-way toolpost build

If it matters, I have a small fly cutter (about 1½" diameter) that has 10-32 set screws. I use only two of them and have no issues with restraining the tool, which is 3/8' square. I'm known to take serious cuts (in aluminum) and to operate the fly cutter @ 4,200 rpm. I think the fly cutter is made o...
by Harold_V
Sat May 09, 2020 1:07 am
Forum: Lathes
Topic: Repowering SB 9" Lathe
Replies: 19
Views: 1146

Re: Repowering SB 9" Lathe

or attic circulation fan. Blink! Blink! You're kidding, right Bill? :wink: I can think of little that would be as annoying as an attic fan that kept the entire house rumbling. I ran an American made single phase motor on the fan for my fume hood, which often ran 24/7. Damned thing hunted constantly...
by Harold_V
Fri May 08, 2020 4:18 pm
Forum: Lathes
Topic: Anyone familiar with Supermax Lathes
Replies: 4
Views: 893

Re: Anyone familiar with Supermax Lathes

Yep! Many years ago I had need for multiple drill press spindles. I ended up purchasing three Jet drill presses, which were made in Japan. When the job was completed, I sold two of them. They were of exceptional quality, as, by then, made in Japan had proven to be a good thing. That is a far cry fro...
by Harold_V
Fri May 08, 2020 4:14 pm
Forum: Milling Machines
Topic: Lead screws
Replies: 8
Views: 754

Re: Lead screws

I'm curious why you think they need to be replaced. Backlash with machine tools is a fact of life, and is generally dealt with by understanding. Thirty thou is not excessive, so unless the machine in question has an extremely fine screw (not usually the case), it most likely isn't a problem. Please ...