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| Making an accurate spindle with an innacurate chuck. |
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| tekfab:
I assume this 10" shaft extension runs in a support bearing of some description ? because if not you really are fighting an uphill battle ! Right, now for the lecture, If you've gone to all the trouble to buy a lathe then at least spend some time installing it and aligning it before trying to use it ! And whats all this crap about waiting until you can afford a milling machine ? There's no point in having a machine that you cant go and switch on and use with some degree of accuracy is there ? And finally you show up as living in the North East there are some very very experienced machinists on this Forum who are local to you why dont you try PMing them and see if they can come and offer some advice it would be a dam sight easier than the rest of us trying to guess what you've got and what you've done RANT OVER ! Good Luck ! Mike |
| Fergus OMore:
Consett? Ah yes! Was offered a couple of llamas or was it alpacas, the other night from a guy near there. Not sure, it was one of those nights. About 70 of us, 17 courses and a lot of alcohol in Chinatown. Best giggle since I was offered a quarter scale Tornado bomber- to stick in my garden. However, I'd ask Chronos about your duff chuck. As it reads, no one in business today wants people to receive adverse criticism here or anywhere else. You know the old adage 'It takes 10 years to create goodwill and 10 minutes to lose it' Inthis climate, it has never been truer. Let's know how it works out. Norman As a sort of reply to Mikes comments. Sadly, I have only had a couple of evenings off since March. Wife had hip op. It went wrong- injections and paralysed. Now it is cataracts for her as well. I can scribble a few words of possibly constructive advice. N |
| AdeV:
--- Quote from: S. Heslop on November 21, 2013, 09:27:28 AM ---Just checked the face of the chuck and the wobble is pretty huge. With the jaws in place I could only turn it about 40 degrees but the dial moved about 0.15mm in that small arc. I then checked the backplate face (it overhangs a bit so I can check without removing the chuck) and thats still running perfect. I dont think headstock alignment should be a problem for this though, any misalignment would just lead to a tapered shoulder on the spindle. The jaws themselves are very loose in the chuck body's tracks. I guess I just bought a rubbish chuck! --- End quote --- Ugh :( Both sound like they are likely to cause your problem. eg. when you clamp a bar up, the jaws will try to tilt, nose up or down, that's going to reduce the clamping pressure on your bar & allow it to move around. For the front to be that far out of kilter, it does sound like the back of the chuck is buggered. Between the two, yeah, you're SOL looking for any accuracy. Since it sounds like you got stiffed by Chronos, I'd give 'em a call - be all nice about it, but basically try to get them to at least take the thing in to have a good look at it. As they are in stiff competiton with RDG, Arc Euro & Gloster (at the very least), getting a bad rep is the last thing they want... Meanwhile, scour eBay for 2nd hand chucks of about the right size. Go looking for those pokey looking 2nd hand tool shops, it's surprising how much engineering stuff you'll find within. If you're NE based, there's bound to be one somewhere, so many old machine shops & hobbyists closing down. Or just hang around outside Norm's place, sounds like his skip is worth a rummage through... |
| S. Heslop:
--- Quote from: tekfab on November 21, 2013, 04:00:10 PM ---I assume this 10" shaft extension runs in a support bearing of some description ? because if not you really are fighting an uphill battle ! Right, now for the lecture, If you've gone to all the trouble to buy a lathe then at least spend some time installing it and aligning it before trying to use it ! And whats all this crap about waiting until you can afford a milling machine ? There's no point in having a machine that you cant go and switch on and use with some degree of accuracy is there ? And finally you show up as living in the North East there are some very very experienced machinists on this Forum who are local to you why dont you try PMing them and see if they can come and offer some advice it would be a dam sight easier than the rest of us trying to guess what you've got and what you've done RANT OVER ! Good Luck ! Mike --- End quote --- I think you're right about the support bearing. It's something i've been thinking about. The spindle fits through the hole in that mounting block. This assembly is held vertically, it's part of a spindle sander i'm building, and the motor slides back and forth along the rods constantly. Despite taking care in laying it out, the hole is off by a small amount so i'd have to turn a bushing eccentric. Or make it an undersized top hat and fill the space with epoxy. As for the lathe, it's one of many things i've needed to 'fix' but I tend to leave problems until I really need them fixed. I haven't required the lathe to be that accurate until now. I've got so many things I could and probably should improve on that i'd never find time for anything else if I really started pursuing them. Plus those machinists in the north east have their own things to worry about. I don't want to impose on them, but with a thread like this people are free to answer or ignore it as they see fit. (and by the end of the day i'd like to solve these problems as much on my own as possible.) --- Quote from: Fergus OMore on November 21, 2013, 04:14:39 PM ---As a sort of reply to Mikes comments. Sadly, I have only had a couple of evenings off since March. Wife had hip op. It went wrong- injections and paralysed. Now it is cataracts for her as well. I can scribble a few words of possibly constructive advice. --- End quote --- Sorry to hear that about your wife. Old age isn't treating my grandma very well either, but it always seems like it's harder on my grandad than her. But don't feel you have to come over and fix my problems for me. --- Quote from: AdeV on November 21, 2013, 06:00:44 PM ---Since it sounds like you got stiffed by Chronos, I'd give 'em a call - be all nice about it, but basically try to get them to at least take the thing in to have a good look at it. As they are in stiff competiton with RDG, Arc Euro & Gloster (at the very least), getting a bad rep is the last thing they want... --- End quote --- It was a couple of years ago now and i've never been a big fan of returning items. It's a big hassle, they make you pay the postage, and then there's no guarentee the replacement will be any better. I wish I knew of some second hand tool shops. You never find anything in the yellow pages, or their website, so the only way to find out is by word of mouth or just stumbling on them. |
| awemawson:
I wouldn't write off Chronos on a single issue. I've had very good service from them recently - admittedly only on small stuff but the service has been very good and amazingly prompt. I still wonder if your chuck is actually sitting flat on your backplate as that's the most likely place for errors. As I understand it you've clocked the face of the backplate - can you clock the rear of the chuck body ? It seems very unlikely that the back and front of the chuck body would not be parallel as I'm sure they are machined at the same mounting in manufacture. Andrew |
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