Search found 176 matches
- Tue Mar 24, 2009 12:34 pm
- Forum: General Discussion
- Topic: Lead Screws and Ball Nuts and Associated Stuff
- Replies: 5
- Views: 1796
Just to clarify, leadscrews and ballscrews (and thus ballnuts) are very different things. I'm going to assume you mean the latter. They can be had from various vendors, in various accuracies, at a variety of costs per foot. Never having had to buy a ballscrew, I can't say what those prices are. They...
- Mon Mar 23, 2009 2:10 pm
- Forum: General Discussion
- Topic: 4 jaw chuck
- Replies: 58
- Views: 12060
I am not trying to be a big confrontational asshat here, but this is my experience so far in a production shop. Take this for what it is. I find soft jaws have superior clamping on out of round parts and scale. When one crushes the part with hard jaws, it releases some of the clamping pressure from ...
- Mon Mar 23, 2009 9:04 am
- Forum: Lathes
- Topic: American v. Chinese Lathe; More Confused Than Ever
- Replies: 43
- Views: 16893
There've been some interesting posts on PM and articles in the industry magazines lately from manufacturing folks in China, both mainland and Taiwan. The same message comes out. They can build much, much more accurate and better designed machines than we think they can. They build these for their ow...
- Sun Mar 22, 2009 10:04 am
- Forum: Lathes
- Topic: Toolbit grinding
- Replies: 25
- Views: 9155
- Sun Mar 22, 2009 9:46 am
- Forum: Home Shop CNC & 3D Printing
- Topic: realistic CNC purchase?
- Replies: 13
- Views: 8260
- Sat Dec 13, 2008 10:35 am
- Forum: General Discussion
- Topic: Lapping help needed. . .
- Replies: 21
- Views: 5636
- Fri Dec 12, 2008 4:29 pm
- Forum: General Discussion
- Topic: 5C Spin Indexer
- Replies: 12
- Views: 4683
Spin indexers only lock in every 15 degrees or so. No free spinning, so no endmill sharpening/etc. The rotary table is far more versatile overall, and can do everything the 5c can do but slower. I prefer working with a spin indexer if possible, just for the speed. However, if I had to only have one,...
- Wed Dec 03, 2008 9:44 am
- Forum: Home Shop CNC & 3D Printing
- Topic: I want to CNC an old Logan Lathe
- Replies: 6
- Views: 4571
- Tue Dec 02, 2008 2:12 pm
- Forum: Home Shop CNC & 3D Printing
- Topic: I want to CNC an old Logan Lathe
- Replies: 6
- Views: 4571
True. CNC lathes do not infeed on an angle for threading, nor do they care about the compound slide in the first place. My recommendation is to remove the compound entirely and replace it with a solid platform for a toolholder or turret. Add rigidity and remove a source of positioning error in one f...
- Sat Nov 22, 2008 9:58 pm
- Forum: Milling Machines
- Topic: seal killer's Next Mill
- Replies: 45
- Views: 10894
Foundation requirements for most machines are not insane. What a person has to keep an eye on is level. As you put a heavy machine tool in place, over the next few weeks the owner will need to check and re-level the base as everything settles. Even after the majority of the settling has completed, i...
- Fri Nov 21, 2008 7:05 pm
- Forum: General Discussion
- Topic: China and India Machine Tools
- Replies: 21
- Views: 7695
I would disagree that modern american made machine tools are the best, and I'd like to justify that by talking out in left field for a couple paragraphs. Old american iron is good, new american iron is.. pretty good? But I don't believe the best. The japaneese currently manufacture the best all-purp...
- Thu Nov 20, 2008 4:47 pm
- Forum: General Discussion
- Topic: ream, drill size
- Replies: 6
- Views: 2930
Boring bar. Reamers and double drilling work great - provided you can test the process on a blank first in identical conditions. For critical stuff, I never, ever just do it if I'm going to be using a reamer. My experience so far has been that even an expensive, high quality reamer can vary as much ...