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| help locating tubing | |||
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| Posted by: CCR5600Design ® 02/10/2010, 12:16:33 Author Profile eMail author Edit |
Hi guys! Long time no see. I am currently working on a project that requires the use of a stepped bushing. The ID of the bushing is 0.500 and the OD is 0.745" as measured. I am trying to locate a supplier for tubing to support the bushing with an ID of 0.748"-0.750" ID. In the Ryerson Tull stock guide, I found 5 different OD tubing with the appropriate wall thickness to achieve the desired ID, but alas... none of our local steel suppliers stock this size tubing and a minimum order of several hundred feet is required for purchase. Drat! Add to that a 3-4 week lead time. Double drat!! What do you guys do when you need tubing in a hurry (and don't have access to a lathe to make adjustments)?
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| Posted by: Marky ® 02/10/2010, 12:31:58 Author Profile eMail author Edit |
Hi Ron....McMaster has 1.25 OD x .75" ID..Could you expanding hand reamer the ream the ID? Modified by Marky at Wed, Feb 10, 2010, 13:46:29 |
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| Posted by: RWOLFEJR ® 02/11/2010, 11:35:35 Author Profile eMail author Edit |
This is who we use for one or two pieces etc...
https://www.marmonkeystone.com/ecomm/servlet/LocationServlet They don't have any minimum order quantity. You might ask them if they have a drop laying around because they will charge you to cut a stick. You end up paying for the whole stick basically whether you take it all or not. Don't know if UPS or USPS will ship a ten to twelve foot random? Don't know how long a piece you're after and how deep into the piece your bushing/ bushings will be but isn't the fit you described going to be a bit baggy? Guess you could dimple the bushing all around with a sharp punch and keep it still in your tube. If concentricity is an issue then you might run into trouble there too...? Might also consider a pipe size if you can drill and ream? You can pick up pipe anywhwere in short pieces, or nipples... (Family Guy type laugh required...) If you're near Rochester PA shoot me an e-mail... I can probably dig you up what you need from our misc. area in the shop. Good Luck,
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| Posted by: CCR5600Design ® 02/11/2010, 11:45:38 Author Profile eMail author Edit |
Bob, Thanks for the suggestion about the pipe, but we looked into that and found it to be a bit too large ID. The tube will be powderdoated prior to the installation of the bushing and will take up much of the clearance. This does not support a heavy load,nor does it encounter repetitive rotation.
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| Posted by: CCR5600Design ® 02/12/2010, 12:19:39 Author Profile eMail author Edit |
Ok, sometimes you have to think outside the box (or in this case, outside the tube!). I was chatting with my boss (as sometimes two heads are better than one, even if one is a cabbage!)about this problem and our deadline was rapidly approaching. We determined that if we could not find suitable tubing in a reasonable timeframe, we needed to explore other options. We broke down the challenge that lay at hand. We had to be able to accommodate a commonly available bushing to support the ends of an arm AND be able to manufacture this bearing support with tools at our disposal. I had a moment of clarity! Our shop deals with mostly sheetmetal. We have available CNC turret punches, lasers and pressbrakes. My idea was to use the laser to accurately cut out a flat pattern from 7 gage hot-rolled steel that, when formed with the pressbrake, would make a "C"-channel. The holes needed to support the bushing would be cut into the flat pattern and when formed would align to allow two bushings to be installed in the opposing flanges to support the shaft. This worked perfectly and cut out the welding process I had originally intended to support the tube. I guess the point is this. If you find yourself at an impasse, sometimes it is better to back up and go around to make continual progress rather than to beat your head against a brick wall and fall out of the race altogether. Don't be afraid to ask questions and don't be afraid to receive answers.
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| Posted by: Marky ® 02/12/2010, 12:53:48 Author Profile eMail author Edit |
MacGyver would be proud of you Ron. Glad it worked out |
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| Posted by: CCR5600Design ® 02/13/2010, 10:07:50 Author Profile eMail author Edit |
MacGyver ain't got nothin' on me! LOL! Toss me a roll of duct tape and a lantern battery and things happen in a hurry! Ron |
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