Search found 17644 matches

by Harold_V
Fri Apr 03, 2020 4:29 pm
Forum: Lathes
Topic: NMG carbide negative rake inserts for SB9
Replies: 6
Views: 89

Re: NMG carbide negative rake inserts for SB9

Hi guys, I have recently bought my SB9. Love it. as I do not know how to sharpen and maintain old tooling. What do you say? What I say is you would be far better off learning to deal with HSS cutters. If you don't, you'll struggle with any choices you make, because you don't understand how or why a...
by Harold_V
Thu Apr 02, 2020 5:57 pm
Forum: General Discussion
Topic: fixing go cart for next generation
Replies: 21
Views: 480

Re: fixing go cart for next generation

The proper way to do this is to put a spacer in between the bearings, crank it as tight as you want and not hurt the bearings I agree. A friend, a few years ago, asked me to take a look at his Jet bandsaw, which kept losing bearings on a given shaft. Turns out they had made the saw without using a ...
by Harold_V
Thu Apr 02, 2020 3:30 am
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 1267

Re: Potting electrical coil in steel

Thanks, John. All very good tips. I'm somewhat out of my element with this project, so any guidance I can get is welcome.

H
by Harold_V
Wed Apr 01, 2020 3:30 pm
Forum: General Discussion
Topic: Tapping Heads Tapmatic A5 and ?
Replies: 19
Views: 1654

Re: Tapping Heads Tapmatic A5 and ?

I strongly suspect that the thread is 1¼"----but I agree that the minor diameter is a bit small if it is. A real puzzle unless the thread is a bastard. Heh! For what ever reason, I had 20 pitch stuck in my head. It's obvious that Glenn is correct, that the bore is well within range for 16 pitch. Th...
by Harold_V
Wed Apr 01, 2020 3:24 pm
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 1267

Re: Potting electrical coil in steel

but I can't see why the bearings couldn't move That's quite simple. The washers you used to form the sides make contact with both the inside and outside races, clamping them together. I realize they are a necessity, but the sides must NOT contact the outer races. The washers can be easily relieved ...
by Harold_V
Wed Apr 01, 2020 3:10 pm
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 1267

Re: Potting electrical coil in steel

Bill, I have one apart now. I know it's wound with a wire size of .018" (appears to be #26 American wire gauge). I have split the coil and taken a photo, which I will crop and enlarge so I can count the turns. I can wind the coil, using the lathe (it still operates, just without one of the speeds), ...
by Harold_V
Wed Apr 01, 2020 4:16 am
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 1267

Re: Potting electrical coil in steel

Heh! That was a good source, assuming I was filthy rich. I paid about $4,500 for my lathe, new. It contains six of those clutches. I realize that times have changed, and that the dollar isn't what it used to be, but I'd have to rob a bank to afford their offering. - Electric clutch for Sag 12 € 680 ...
by Harold_V
Wed Apr 01, 2020 1:55 am
Forum: Milling Machines
Topic: Uneven cut
Replies: 8
Views: 323

Re: Uneven cut

From the first picture, it wasn't obvious to me that the pattern generated was along the length of the piece shown. With the second image, it's now clear that the problem you see isn't related to the gib of the machine, but the cutter itself. If you examine the end mill cutting edges I'm quite sure ...
by Harold_V
Wed Apr 01, 2020 1:31 am
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 1267

Re: Potting electrical coil in steel

Thanks, Bill. I hadn't found that source. I'll give them a go to see if they can help. I'm not all that anxious to try the rewind, but I'll do what I have to to get back the missing speed. Besides, all the clutches are identical, so if I can fix them, I won't have to worry about future failures. I f...
by Harold_V
Tue Mar 31, 2020 3:41 pm
Forum: General Discussion
Topic: Tapping Heads Tapmatic A5 and ?
Replies: 19
Views: 1654

Re: Tapping Heads Tapmatic A5 and ?

Your math isn't correct. Thread depth is on the radius, not the diameter. You should have added an additional .038" to your target diameter. I strongly suspect that the thread is 1¼"----but I agree that the minor diameter is a bit small if it is. A real puzzle unless the thread is a bastard. H
by Harold_V
Tue Mar 31, 2020 3:39 am
Forum: Milling Machines
Topic: Tramming range
Replies: 3
Views: 285

Re: Tramming range

The overall accuracy of a mill begins with the column, knee, and way surfaces. Here's what I recommend. Begin by checking the gib on the knee. It should be snug, but not overly tight. The knee should be able to just settle by its weight, not driven downward by the screw. When the gib is adjusted (a ...
by Harold_V
Mon Mar 30, 2020 1:56 am
Forum: General Discussion
Topic: Homemade indexing head
Replies: 6
Views: 357

Re: Homemade indexing head

When I refined precious metals, I melted pure copper on several occasions, to cast ingots (it was used to recover silver from solution). The melting point of copper is well below the melting point of gray iron. I can only imagine what your experience was like.
Thanks for your comments.

H