Search found 96 matches

by RMinMN
Thu Jun 25, 2020 6:06 am
Forum: Welding
Topic: Help choosing a plasma cutter for my home shop.
Replies: 9
Views: 2360

Re: Help choosing a plasma cutter for my home shop.

I “had” a miller spectrum 3080 until it got stolen and I may say it was great with its ability to work 110 or 220 volt in 20, 30, 40, 50 amps that could cut up to 7/8”. But since then I got an inexpensive Chinese import for $550.00 and the ability to cut 1-1/4” these depths are all with a single pa...
by RMinMN
Thu May 14, 2020 4:25 am
Forum: General Discussion
Topic: Best lube for wood planer gear train?
Replies: 10
Views: 1308

Re: Best lube for wood planer gear train?

Wood planers are much quieter if the blades are sharp. As the edge gets worn they hammer into the wood instead of slicing.
by RMinMN
Mon May 11, 2020 5:32 am
Forum: Milling Machines
Topic: Lead screws
Replies: 8
Views: 1370

Re: Lead screws

I'm not an experienced machinist so take this with a grain of salt. CNC machines need nearly zero backlash. To get this they replace the acme leadscrew with rolled ballscrews. These come it different diameters, lengths, and quality. Making one fit your machines may not be possible but it is somethin...
by RMinMN
Sat May 09, 2020 5:01 am
Forum: Lathes
Topic: Repowering SB 9" Lathe
Replies: 19
Views: 2252

Re: Repowering SB 9" Lathe

Hf motor? Smooth motors make good surface finishes on lathes. Not sure hf motive power will qualify. My experience with them has included Bad centrifugal switches Bad caps Bad bearings Loose bearings on shafts and in housings Crappy uneven windings causing motors to 'cog' Run out on output shafts. ...
by RMinMN
Sat May 09, 2020 4:56 am
Forum: General Discussion
Topic: 4-way toolpost build
Replies: 13
Views: 1900

Re: 4-way toolpost build

If your friend is taking such deep cuts on that Atlas 618 that 10-24 socket head cap screws won't hold the cutter bit, I want to be there to watch. The bit should not extend far beyond the end of the holder for rigidity which then puts little strain on the screws securing it. It does need 2 screws, ...
by RMinMN
Sat May 02, 2020 8:04 am
Forum: Lathes
Topic: Need help finding Change gears - JET GH-1340
Replies: 17
Views: 1848

Re: Need help finding Change gears - JET GH-1340

The gears in a truck transmission have to be steel and good quality to be quiet and transmit the required torque. The change gears on a lathe don't have that much torque stress on them so they don't need to be so strong. Find someone with a 3D printer and make them from PLA. They may not last as lon...
by RMinMN
Sat May 02, 2020 7:51 am
Forum: Milling Machines
Topic: Gear cuting
Replies: 17
Views: 2271

Re: Gear cuting

Would this be the good place to fit in a stepper motor to make the required amount of turns. They can be quite accurate and repeat very nicely without getting distracted. The gcode for something like that should be quite simple.
by RMinMN
Sat Apr 25, 2020 4:59 am
Forum: General Discussion
Topic: Packing gear cases with grease
Replies: 11
Views: 1910

Re: Packing gear cases with grease

Interesting aside, at least to me. My snowblower manufacturer seemed to adhere to convention and fill the worm gearbox 2/3 with grease just like they should and it didn't leak out through the seals that way. However, snowblower gearboxes do not get warm enough in northern Minnesota for any oil to le...
by RMinMN
Mon Apr 20, 2020 4:59 am
Forum: General Discussion
Topic: 123 blocks Dumb Question
Replies: 12
Views: 2690

Re: 123 blocks Dumb Question

Use your mill to make new T-nuts with 3/8" tapped holes.
by RMinMN
Wed Apr 15, 2020 5:27 am
Forum: Lathes
Topic: Question: Parting Blade Thickness
Replies: 25
Views: 5984

Re: Question: Parting Blade Thickness

Regrind, then hone the cutting edge. I've been able to do a reasonable job of parting on my mini-lathe by keeping that edge very sharp and everyone says that a mini-lathe is as rigid as a wet noodle.
by RMinMN
Wed Apr 08, 2020 5:05 am
Forum: Lathes
Topic: Bad vibrations; is it in my head?
Replies: 26
Views: 4781

Re: Bad vibrations; is it in my head?

This may not be the problem but have you ever experienced a tapered roller bearing that has flaked off a bit of metal from one of the tapered rollers? No movement or slack in the bearing but lots of rumble.
by RMinMN
Thu Apr 02, 2020 4:48 am
Forum: General Discussion
Topic: Drilling #8 Rebar
Replies: 5
Views: 1381

Re: Drilling #8 Rebar

Does the job you have actually require rebar? There may better solutions. Give us some hints on what it needs to do.