Search found 1391 matches

by pete
Sat May 19, 2018 1:02 am
Forum: General Discussion
Topic: Scale weight
Replies: 6
Views: 227

Re: Scale weight

Think of scale weights like this. Lets say a 1" x 1" x 1" solid steel block weighs one pound. Double it's size so then how much does it weigh? Two pounds? Nope 8 pounds. Doubled in size is 2" x 2" x 2" so 8 cubic inches. It works the same in reverse when scaling down. Let's say full size scaled to 1...
by pete
Thu May 10, 2018 9:02 pm
Forum: Lathes
Topic: Making craftsman lathe parts
Replies: 3
Views: 247

Re: Making craftsman lathe parts

These little 6" lathes were directly aimed at the DIY crowd when they were built. It's at least possible aluminum was used for the cotters. My 3/4 sized BP clone mill seems to use brass cotters for the spindle lock. Either might be correct for yours. My guess is Harold or Spro might know for sure. I...
by pete
Mon Apr 30, 2018 3:42 pm
Forum: Milling Machines
Topic: RE: JET JVM-626
Replies: 7
Views: 449

Re: RE: JET JVM-626

Well chatter under cutting conditions is caused by many factors. Harmonics being only one of them. Painting the inside of the riser with bed liner may or may not help but it can't hurt. I'm going by what I've read about those installing risers on Bridgeport machines and having to reduce feed rates a...
by pete
Sun Apr 29, 2018 4:48 pm
Forum: Milling Machines
Topic: RE: JET JVM-626
Replies: 7
Views: 449

Re: RE: JET JVM-626

I can't help you with a specific manual but the Grizzly website should have a manual for there current version that should be close enough Mike. Jet just like Grizzly doesn't manufacture any machine tools, they have them painted and tagged with there logos. For example my 3/4 sized Bridgeport clone ...
by pete
Sun Apr 29, 2018 2:08 pm
Forum: General Discussion
Topic: Whatzit?
Replies: 11
Views: 688

Re: Whatzit?

Yeah it's a lot of trouble to be sure Earl. Today to be really competitive it's a rich mans sport. They may go through a dozen or more barrels per year trying to find one or two that shoot really well, 10k + practice rounds every year and the barrels those shoot out, complete new rifles every few ye...
by pete
Sat Apr 28, 2018 10:10 pm
Forum: Lathes
Topic: 4-jaw chuck screw removal
Replies: 15
Views: 876

Re: 4-jaw chuck screw removal

Now that cleaned up very well. Nice job.
by pete
Sat Apr 28, 2018 10:09 pm
Forum: General Discussion
Topic: Machining Setup's with Few Comments
Replies: 43
Views: 5314

Re: Machining Setup's with Few Comments

After a thought then with all the time and effort into building a Quorn from a set of casting it's probably not surprising some photos of what it could or maybe should do are staged. I'd be trying to justify all that work myself. :-) Interesting to get some opinions about it being not quite the mach...
by pete
Sat Apr 28, 2018 7:53 pm
Forum: Lathes
Topic: Electronic Leadscrews?
Replies: 19
Views: 1220

Re: Electronic Leadscrews?

My thought as well about the division problem since afaik today about every industrial cnc machine is using metric ball screws. Imperial parts are just oddball metric sized to get those imperial dimensions or there's a possible built in program that allows the direct conversion such as when threadin...
by pete
Sat Apr 28, 2018 7:13 pm
Forum: Lathes
Topic: 4-jaw chuck screw removal
Replies: 15
Views: 876

Re: 4-jaw chuck screw removal

Better to play it safe with chuck disassembly and reassembly imo. With 3 jaw well made chucks it's important to even get the pinions into the same holes during reassembly to duplicate how the chuck was finish ground. An independant may not really matter but I'm no chuck expert.With an independant th...
by pete
Sat Apr 28, 2018 6:57 pm
Forum: Lathes
Topic: Electronic Leadscrews?
Replies: 19
Views: 1220

Re: Electronic Leadscrews?

Hmmm, that's something I didn't know that it wasn't set up to do imperial thread pitches so thanks Will. Seems strangely lacking to not have a system capable of either. I'd have very little need for nor would I want a metric only system.
by pete
Sat Apr 28, 2018 6:46 pm
Forum: Lathes
Topic: Cross slide and compound dials
Replies: 20
Views: 1228

Re: Cross slide and compound dials

Number stamps will work of course, you'd need a fixture to hold them the correct distance from the front or rear of the dial and truly vertical. Then there's exactly how much force is required for each different number so the impression depth is the same if that's important to you. I hate sending wo...
by pete
Sat Apr 28, 2018 6:25 pm
Forum: General Discussion
Topic: Machining Setup's with Few Comments
Replies: 43
Views: 5314

Re: Machining Setup's with Few Comments

I've got Prof. Caddocks book on building the quorn Carrdo. You may or may not know there's been a fair amount written in the U.K. published Model Engineers Workshop magazine about using and extending it's capabilities. A digital subscription to the magazine will get you access to every one of those ...