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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Cupertino, CA - local lathe owner for small help?
Hi,
I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Thanks, Arcady |
#2
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Cupertino, CA - local lathe owner for small help?
On Mon, 30 Jan 2006 08:28:25 GMT, Arcady wrote:
Hi, I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Thanks, Arcady I'm a little confused as to why you can't bore the jaws on the lathe itself with the chuck mounted on the head. -- Skuke Reverse the domain name to send email |
#3
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Cupertino, CA - local lathe owner for small help?
Arcady wrote: Hi, I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Can't you do it on your own lathe? That's the way it's done on the Taig lathe I have, with a boring tool. Leon |
#4
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Cupertino, CA - local lathe owner for small help?
skuke wrote:
I'm a little confused as to why you can't bore the jaws on the lathe itself with the chuck mounted on the head. I have no lathe - what I have is actually a toy. I could reach inside by the boring tool but saddle has no strength to make the boring satisfactory when I work with the metal. Also I cannot fix the jaws properly - I tried and now the inside is bigger then before without the improved quality. I need something heavy to do it properly. Thanks, Arcady |
#5
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Cupertino, CA - local lathe owner for small help?
xray wrote:
This may be fine, but from your picture, the jaws are reversable. I'm not sure if you reference the inside or the outside numbers when assembling it. Is there any chance that the 1 and 3 jaws are in the wrong slots? Maybe there is nothing really wrong except assembly? No - it is assembled properly - you have to refer to inside numbers. Thanks, Arcady |
#6
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Cupertino, CA - local lathe owner for small help?
What about a surface grinder?
Take the jaws out, put them on the table, mark them with dye, surface grind them. Put them back in the lathe, check, then resurface.... xman |
#7
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Cupertino, CA - local lathe owner for small help?
In article , Arcady says...
Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG If you don't mind teh suggestion, you might be better off spending the money you would otherwise pay to have the existing chuck re-worked, buying a small brand new chuck. If you think about it, any job a commercial shop will do on that chuck will be a miniumum of an hour, they will bill at 65 per hour, probably. Take that money, add 20 or so more and purchase a brand new three jaw chuck from bison. You will be much happier with the results in the long run. Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
#8
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Cupertino, CA - local lathe owner for small help?
On Mon, 30 Jan 2006 11:29:07 GMT, Arcady wrote:
skuke wrote: I'm a little confused as to why you can't bore the jaws on the lathe itself with the chuck mounted on the head. I have no lathe - what I have is actually a toy. I could reach inside by the boring tool but saddle has no strength to make the boring satisfactory when I work with the metal. Also I cannot fix the jaws properly - I tried and now the inside is bigger then before without the improved quality. I need something heavy to do it properly. Thanks, Arcady I can do it. I have a Hardinge Tool Room clone with a three jaw that should hold the 2" OD of your 3 jaw easily enough. Understand that when I bore the jaws, the ID will be concentric to the OD of the chuck rather than concentric to the mounting system of the chuck. There may be a difference since you have a "toy" and who knows what the quality of the components may be. I'm in West SJ and work in Sunnyvale. Drop me an private email. ...I hope you're not in a huge rush. -- Skuke Reverse the domain name to send email |
#9
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Cupertino, CA - local lathe owner for small help?
"Arcady" wrote in message et... Hi, I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Thanks, Arcady If you are certain that the jaws are in the correct slots (and engaged to the scroll thread in the correct order) then a Dremel tool secured to the carriage could be used to true the jaws. The jaws need to be tightened against something. Though not as accurate, tightening them against an external ring is much easier and may be good enough for a toy. Don Young |
#10
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Cupertino, CA - local lathe owner for small help?
STOP.
Don't do anything yet. Look at the picture - the jaws are in the wrong positions. The chuck should be out of whack. the numbers on the jaws must match the numbers on the chuck. Simple. Get them in the current slots and then see what it does. In the process - be very sure the threads in the back and the internal area around the jaws are very clean. Metal chips can wedge easily. Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder Arcady wrote: Hi, I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Thanks, Arcady ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#11
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Cupertino, CA - local lathe owner for small help?
On Mon, 30 Jan 2006 23:27:19 -0600, Martin H. Eastburn wrote:
STOP. Don't do anything yet. Look at the picture - the jaws are in the wrong positions. The chuck should be out of whack. the numbers on the jaws must match the numbers on the chuck. Simple. Get them in the current slots and then see what it does. The numbers do match! ...just depends on which number on the jaw you wanna read. -- Skuke Reverse the domain name to send email |
#12
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Cupertino, CA - local lathe owner for small help?
jim rozen wrote:
If you don't mind teh suggestion, you might be better off spending the money you would otherwise pay to have the existing chuck re-worked, buying a small brand new chuck. If you think about it, any job a commercial shop will do on that chuck will be a miniumum of an hour, they will bill at 65 per hour, probably. That's what I mean - 'for few bucks' I did not realize what the work time and price could be. Take that money, add 20 or so more and purchase a brand new three jaw chuck from bison. You will be much happier with the results in the long run. Sure, I checked the sources. The only problem is to find the proper part. It cannot be more then 2" and it must have M12*1 thread - not easy to find at inchland. But I definitely will try this if decide that it's justified. Arcady |
#13
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Cupertino, CA - local lathe owner for small help?
xray wrote:
You have actually done the experiment though, right? Who turned the ends of the jaws? They knew what you know? I did try other way around - it's for external hold - so jaws position is positively correct. Internal whole has been severely damaged and the current state is the after-repair state (very poor repair indeed). Just double checking. The beveled sides of the jaws all touch evenly when you close it all the way? I'm puzzled how the existing hole in the center gets off by 10's of thousandths. Was the chuck off center when it was done? Do you have any idea how it might have happened? Sides touch evenly but the way thing has been fixed made this hole off-center. There is not too much left to try anything but the good lathe - or chuck will be ruined completely due to too big center whole - it is already at least 4mm instead of 2mm. Looks like it worth the attempt but only 'for free' - or it will be smarter to buy the new one. Arcady |
#14
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Cupertino, CA - local lathe owner for small help?
Check old posts by "brownnsharp" for a good technique to adjust
trueness of jaws. brownnsharp Arcady wrote: Hi, I have small 2" lathe chuck with jaws out of true. Whole assembly is running fine with only 2 thou but jaws need to be turned internally (current indicator gives me 0.025"). Is there any body nearby willing to help? For this one I don't need anything better than few thou (jaws are aluminum) but lathe should be able to reach into 10 mm hole and lock the 2" assembly and maybe 1" locking ring should be made to turn the thing properly. Maybe somebody just know local machine shop where it could be done for few bucks? Whole Santa Clara County will do. Here is the pic of this chuck: http://s89568048.onlinehome.us/images/044.JPG Thanks, Arcady |
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