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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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DOM tubing, spec sizes vs "real world" dimensions
hi guys
anybody tried pressing in 'off the shelf' bronze bushings into the ends of DOM steel tube? or does anybody know what the typical ID (and OD) tolerances of DOM steel tube are? I need some that hopefully has a 1.375 OD (OD not real critical) and an ID that's as close to 1.125 as possible (I need to press-fit 1.000 ID bushings into each end). not wanting to 'hire out' lathe work or honing for this fitup, if possible... I can 'move up' to 1.500 OD, if it'd help the ID tolerance closeness any (but I kinda doubt it would) thanks for your real-world experience and sharing the info :-) toolie - - replies to this post by e-mail, if any, please remove the weirdstuff from my address before clicking 'send' - thanks :-) - - |
#2
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DOM tubing, spec sizes vs "real world" dimensions
On Apr 29, 4:39*pm, dave wrote:
hi guys anybody tried pressing in 'off the shelf' bronze bushings into the ends of DOM steel tube? or does anybody know what the typical ID (and OD) tolerances of DOM steel tube are? I need some that hopefully has a 1.375 OD (OD not real critical) and an ID that's as close to 1.125 as possible (I need to press-fit 1.000 ID bushings into each end). not wanting to 'hire out' lathe work or honing for this fitup, if possible... I can 'move up' to 1.500 OD, if it'd help the ID tolerance closeness any (but I kinda doubt it would) thanks for your real-world experience and sharing the info :-) toolie I think you're SOL without a lathe. I just measured a piece of 4130 DOM tubing from Aircraft Spruce as out of round by 0.01". A thin- walled bushing pressed into it will also be out of round and its ID will compress an unknown amount that depends on the press fit. The larger tubing and a flanged bushing should make the ID hold size and roundness better. OTOH a lathe that can pass 1.5" tubing through the spindle will be large and expensive. See the Designer From Hell thread. Inexperience is much more common than the malicious intent suggested. One sign is expecting 3-decimal- place accuracy without a tolerance spec from common structural materials. Jim Wilkins |
#3
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DOM tubing, spec sizes vs "real world" dimensions
On Tue, 29 Apr 2008 16:39:56 -0400, dave
wrote: hi guys anybody tried pressing in 'off the shelf' bronze bushings into the ends of DOM steel tube? or does anybody know what the typical ID (and OD) tolerances of DOM steel tube are? I need some that hopefully has a 1.375 OD (OD not real critical) and an ID that's as close to 1.125 as possible (I need to press-fit 1.000 ID bushings into each end). not wanting to 'hire out' lathe work or honing for this fitup, if possible... I can 'move up' to 1.500 OD, if it'd help the ID tolerance closeness any (but I kinda doubt it would) thanks for your real-world experience and sharing the info :-) toolie - - replies to this post by e-mail, if any, please remove the weirdstuff from my address before clicking 'send' - thanks :-) - - As a general statement, pressed in bushings are reamed to size after installation. Installing pre-made bushings in commercial tubing would require that the I.D. of the bushings be a rather loose fit on the shaft as commercial tubing is not that accurately sized. What clearance are you planning between the bushing and the shaft? If it is loose enough it might work. Bruce-in-Bangkok (correct Address is bpaige125atgmaildotcom) |
#4
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DOM tubing, spec sizes vs "real world" dimensions
"dave" wrote in message ... hi guys anybody tried pressing in 'off the shelf' bronze bushings into the ends of DOM steel tube? or does anybody know what the typical ID (and OD) tolerances of DOM steel tube are? I need some that hopefully has a 1.375 OD (OD not real critical) and an ID that's as close to 1.125 as possible (I need to press-fit 1.000 ID bushings into each end). not wanting to 'hire out' lathe work or honing for this fitup, if possible... I can 'move up' to 1.500 OD, if it'd help the ID tolerance closeness any (but I kinda doubt it would) thanks for your real-world experience and sharing the info :-) toolie - - replies to this post by e-mail, if any, please remove the weirdstuff from my address before clicking 'send' - thanks :-) - - You might want to consider using epoxy or one of the anaerobic adhesives (Loctite) to retain the bushings instead of a press fit. Don Young |
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