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| Sched 40 Stainless Pipe - Thread for Set Screws |  | ||
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| Posted by: baumgrenze ® 03/10/2010, 01:00:53 Author Profile eMail author Edit |
I would like to use a 4" length of 3/4" schedule 40 stainless pipe to make a stop collar to fit a 3/4" stainless rod. The thickness of the pipe is 0.112". The rod to pipe fit is within .004". What size/pitch set screw(s) should I use to tighten the stop collar to the post? I have a vague recollection that there are rules regarding what is appropriate for threading metal of this thickness. If pressed, I could silver solder one or more nuts to the surface of the pipe to increase the thickness of the threaded section. For the record, I am a retired organic chemist trying to create a support for a grape vine from stainless lab rod. Thanks, baumgrenze |
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| : Sched 40 Stainless Pipe - Thread for Set Screws -- baumgrenze | Post Reply | Top of thread | Engineering Forum |
| Posted by: Pinkerton ® 03/24/2010, 21:08:55 Author Profile eMail author Edit |
Just to answer your question, the minimum recommended length of thread is 1.5 x diameter. So, if you were using a #10 set screw, (3/16" diameter) then you would need a 1/4" of thread. Actually 9/32" would be ideal but for what you had in mind, 1/4" would have done fine. I would see no problem with silver soldering, I suspect Marky is thinking of lead/tin solder. |
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| : Sched 40 Stainless Pipe - Thread for Set Screws -- baumgrenze | Post Reply | Top of thread | Engineering Forum |
| Posted by: Marky ® 03/10/2010, 08:36:56 Author Profile eMail author Edit |
Hi Baumgrenze....Grapevine?...if there is wine involved you've come to the right place.  DO NOT SOLDER!!...if it's exposed to the weather the solder could leech down on to the vine. I wouldn't thread at all...could you simply drill a hole thru both parts and use a sheetmetal screw...or even a self-tapping screw? |
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| Posted by: RWOLFEJR ® 03/10/2010, 09:40:02 Author Profile eMail author Edit |
Depending on your available space and loads and what have you... you might find something more suitable in the link below? http://www.mcmaster.com/#shaft-collars/=65nudx The shaft collars come in a variety of styles. For what you seem to be doing I'd suggest a clamp type collar or two piece collar that would loosen up and move easily if adjustments are required. Set screws do have their place in the mechanical world but I'm not a big fan of them. Example being your piece of pipe and a S.S. bar. To keep the set screw from slipping you'll probably need to go with a spiral cup point that'll dig in some. Then you end up with boogers on your shaft that'll make adjustments tough. You could grind little "V's" down the shaft and use a point or cup point s.s.... or mill grooves down the shaft and go dog points... But if you have room, the shaft collars are stout and have a lot of holding power. They're also available in Stainless Steel for a breath more $$. Good luck and enjoy the fruits of your labor... (sorry... couldn't resist that one...) |
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| Posted by: baumgrenze ® 03/12/2010, 18:26:42 Author Profile eMail author Edit |
Thank you, RWOLFEJR! It is so helpful to have a name for what you want. I found a $3.20 zinc plated collar with free shipping. I can't fabricate something for that price. This is probably a one-time installation, so set screw damage to the shaft is not a problem. The 3/4" rod was salvaged from a heavy duty lab rack when we remodeled my lab in 1980. I coupled two lengths with a coupling nut so I could drive one well into the ground. It is nice stainless and never showed rust, even in a lab where other stainless gave problems. I think I will make a couple of 2-3' horizontal arms to mount on the shaft, and I will tie the ends back to the top of the shaft with some stainless throttle cables I salvaged a few years ago. It will be a year or two until this vine produces fruit. The one we planted in 1971 finally gave up the ghost last summer. Thanks again, baumgrenze baumgrenze |
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| Posted by: missbecky ® 03/24/2010, 19:07:08 Author Profile eMail author Edit |
You can always just cut an X patern in the end of the pipe with a hack saw about 1-1/2 to 2" down the end of the tube and use 3/4" S.S. hose clamp... Be sure to use a round file or some emery to de=bur before assembling... S.S. with S.S. setscrews run the risk of seizing nd or galling if the thread fit is not a good fit.. but if you are going to set screw...10-32 X 3/32" are a pretty common size and you can get a few full threads on a sch 40 pipe...use a sharp tap and a few drops of Kerosene or SS tap fluid |
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