Search found 1185 matches

by John Hasler
Tue Jun 18, 2019 1:29 pm
Forum: Live Steam
Topic: weird RR machine
Replies: 3
Views: 203

Re: weird RR machine

It's function is clearly to transport and power the apparatus mounted on the right end. No idea what that is, though.
by John Hasler
Mon Jun 17, 2019 8:41 pm
Forum: Lathes
Topic: Newbie - Buying first metal lathe
Replies: 50
Views: 905

Re: Newbie - Buying first metal lathe

Before you, or anyone without a little experience, can judge that they are achieving good results, they must have something with which to compare. Sticking with any given type of tool does NOT provide that experience. H Thus my plan to start experimenting with insert tooling as soon as I get around...
by John Hasler
Mon Jun 17, 2019 10:10 am
Forum: General Discussion
Topic: Fan Motor Bearing
Replies: 17
Views: 2511

Re: Fan Motor Bearing

Bill Walck writes: A popular motor design in the past for table fans and other low-powered applications was the shaded pole. This is what is shown in the electromagnet application photo. With DC, there is no fluctuating magnetic field to induce a counter EMF in the heavy wire, so its removal is oper...
by John Hasler
Sun Jun 16, 2019 6:06 pm
Forum: General Discussion
Topic: Turning plastic on a metal lathe
Replies: 16
Views: 320

Re: Turning plastic on a metal lathe

One plastic to be careful when machining: PVC. It can off-gas chlorine which will quickly rust any exposed metal surfaces. I always prep the machines by applying a coating of oil for protection. It wipes clean when the job in done. ~RN Machining isn't going to get PVC hot enough to release chlorine.
by John Hasler
Sun Jun 16, 2019 8:16 am
Forum: Lathes
Topic: Newbie - Buying first metal lathe
Replies: 50
Views: 905

Re: Newbie - Buying first metal lathe

BigDumbDinosaur writes: I'll second what Harold says about inserts. Years ago... Carbide has changed quite a bit. Sharp micrograin inserts are readily available with chip breakers, positive rake, and included angles down to 30 degrees. I'm looking forward to experimenting with some as soon as I find...
by John Hasler
Tue Jun 11, 2019 7:27 pm
Forum: General Discussion
Topic: Large motors and soft start
Replies: 30
Views: 784

Re: Large motors and soft start

That would have to be a dual voltage delta. Star-delta isn't possible because there's no way to connect it star. See

https://www.efficientplantmag.com/2016/ ... -mistakes/

Part-winding start might be a possibility.
by John Hasler
Tue Jun 11, 2019 12:07 pm
Forum: Lathes
Topic: Newbie - Buying first metal lathe
Replies: 50
Views: 905

Re: Newbie - Buying first metal lathe

I'm not sure how much threading I'll be doing.. but it is something I want to be able to do. How important is a thread dial? I'm assuming that on machines that dont have one, your only option is not not disengage the half nut while your are threading.... ie.. make a cut... back your tool out, chang...
by John Hasler
Sun Jun 09, 2019 7:28 pm
Forum: General Discussion
Topic: Large motors and soft start
Replies: 30
Views: 784

Re: Large motors and soft start

Bentworker writes: I very much doubt they would be agreeable to installing larger fuses, I probably wouldn’t ask, because the last thing you want to do is attract utility attention to your giant inductive load with horrible power factor. You might find yourself paying for larger transformers, power ...
by John Hasler
Sun Jun 09, 2019 3:23 pm
Forum: General Discussion
Topic: Large motors and soft start
Replies: 30
Views: 784

Re: Large motors and soft start

I would be amazed if there aren't overloads.

The 50 A is reactive current.
by John Hasler
Sat Jun 08, 2019 5:38 pm
Forum: Lathes
Topic: Spindle bearing replacement
Replies: 31
Views: 939

Re: Spindle bearing replacement

Wolfgang writes: Here is a thought: If the class run-out tolerances are .0002" max. and .0004" max (P5 and P6 limits for the larger bearings respectively, what are the odds of getting bearings with run-outs of about half of the limits specified? I'm thinking here of the standard distribution of actu...
by John Hasler
Sat Jun 08, 2019 5:27 pm
Forum: General Discussion
Topic: Large motors and soft start
Replies: 30
Views: 784

Re: Large motors and soft start

I second the star-delta starter suggestion. If that option is unavailable slower fuses have a good chance of working.
by John Hasler
Fri Jun 07, 2019 4:39 pm
Forum: Lathes
Topic: Spindle bearing replacement
Replies: 31
Views: 939

Re: Spindle bearing replacement

You are measuring the vector sum of spindle runout, collet runout, and gauge pin runout. Because you are measuring 1" out part of what see may also be due to misalignment of the headstock and/or crookedness of the collet and/or pin. Measure the spindle runout by placing the ball of the DTI probe di...