Search found 1322 matches

by John Hasler
Tue Jan 31, 2017 6:59 pm
Forum: Lathes
Topic: Center drilling (More basic questions)
Replies: 77
Views: 12625

Re: Center drilling (More basic questions)

"Ram" is also used (not by me).
by John Hasler
Mon Jan 30, 2017 8:21 pm
Forum: Lathes
Topic: Center drilling (More basic questions)
Replies: 77
Views: 12625

Re: Center drilling (More basic questions)

Concentric with what? Is this precision shaft into which you want to drill a perfectly centered hole or a piece of cold-rolled stock that you intend to turn between centers?
by John Hasler
Mon Jan 23, 2017 4:27 pm
Forum: General Discussion
Topic: ANSI Standard Force and Shrink Fits
Replies: 12
Views: 2879

Re: ANSI Standard Force and Shrink Fits

I did the shrink fit for iron wheels recently. Calculating the coefficient of expansion I chose 300*F for 1" dia. Didn't work. The heat transfer is VERY fast. 500* gave enough clearance vs time to get'er in there to the shoulder. :D RichD I once made the mistake of trying to shrink-fit a bronze bus...
by John Hasler
Sat Jan 21, 2017 9:04 pm
Forum: Lathes
Topic: Well, my motor exploded and I need a new one.
Replies: 45
Views: 8711

Re: Well, my motor exploded and I need a new one.

I have to disagree with one thing that a lot people are saying ... not to use a 1hp motor .keeping in mind that the lathe probably uses a 3L or smaller belt it isn't going to matter much what the motors rated power is . The belt will only transmit so much power before slipping under proper tension ...
by John Hasler
Wed Jan 18, 2017 6:45 pm
Forum: Lathes
Topic: Help in making a tiny bushing
Replies: 36
Views: 8907

Re: Help in making a tiny bushing

Harold writes:
> Ignore the suggested idea of using a collet

I said "Use a collet" in response to the suggestion that he glue the reamed part to a mandrel and then "chuck it up". Obviously a single setup is to be preferred if it is possible.
by John Hasler
Tue Jan 17, 2017 9:00 pm
Forum: Lathes
Topic: Help in making a tiny bushing
Replies: 36
Views: 8907

Re: Help in making a tiny bushing

Pipescs wrote: Chuck up on the steel shaft and turn your bushing to finish diameter.
Use a collet if concentricity is important.
by John Hasler
Sun Jan 15, 2017 7:49 pm
Forum: Lathes
Topic: 9x20 Sudden Chatter
Replies: 9
Views: 2861

Re: 9x20 Sudden Chatter

> I can stop the howling ... by using a live center

I think that's significant. If it was anything on the carriage I don't see how a live center would help.
by John Hasler
Sat Jan 14, 2017 6:18 pm
Forum: Lathes
Topic: Well, my motor exploded and I need a new one.
Replies: 45
Views: 8711

Re: Well, my motor exploded and I need a new one.

Maybe fix the motor you've got and plan on replacing it later when you have more time? Make sure it was the run cap, though.
by John Hasler
Sat Jan 14, 2017 12:16 am
Forum: General Discussion
Topic: ANSI Standard Force and Shrink Fits
Replies: 12
Views: 2879

Re: ANSI Standard Force and Shrink Fits

If you are going to use a heat/ cool joint, a word of advice. Make sure that the cooled axle can be pressed home with one quick motion. As soon as the two get together, heat transfer takes place, and you end up with the axle about half way in and it wont go any further without using a press. CZ It ...
by John Hasler
Thu Jan 12, 2017 12:43 pm
Forum: Casting & Foundry Work
Topic: OSHA Issues Final Rule for Beryllium
Replies: 18
Views: 11671

Re: OSHA Issues Final Rule for Beryllium

As I recall, it's the dust that is bad, if you inhale it. So machine it, grind it, whatever, there can be a problem without the proper PPE. I don't think the finished beryllium is hazardous, but with OSHA....who knows. They think Mother's milk is a carcinogen. ;) The dust is dangerous if you breath...
by John Hasler
Tue Jan 10, 2017 7:30 pm
Forum: Lathes
Topic: Parting with internal thread
Replies: 15
Views: 3910

Re: Parting with internal thread

When the parting tool breaks through the brass part it may grab it and tighten it on the threaded rod pinching the parting tool. That wouldn't have a happy ending. I see no reason to expect that with a short, fat, stiff parting tool, which he can use here since the cut is wide and shallow. Perhaps ...
by John Hasler
Tue Jan 10, 2017 2:22 pm
Forum: Lathes
Topic: Parting with internal thread
Replies: 15
Views: 3910

Re: Parting with internal thread

Blackwatch42nd wrote:Thanx to all for the quick reply.

JohnH: My latest thoughts were along yours. But I'm thinking a sacrificial all thread rod. I could thread it in to the piece, center drill it and use a live center to support the whole business.
John
That's what I meant.