Leadscrew design
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: Leadscrew design
: Leadscrew design -- skewhole	Post Reply	Top of thread	Engineering Forum

Posted by: Marky ® 03/11/2010, 07:13:08 Author Profile eMail author Edit

Hi...It depends what your using the lead screw for. A small mechanism/design is fine....just don't lift a house with it. Send a picture of your final design....we'd like to see it.

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: : Leadscrew design -- Marky	Post Reply	Top of thread	Engineering Forum

Posted by: jboggs ® 03/11/2010, 07:44:08 Author Profile eMail author Edit

As Marky said, it depends on what you are trying to do with it. How much linear force will it generate? How fast will it travel? How often will be moved? All these questions can lead to failure. Normally an acme thread form is used for leadscrews/nuts rather than the standard UNF thread form because its characteristics better suit the application. If you are making one, have you considered just buying the leadscrew and nut from Nook, McMaster-Carr, or someone else?

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: : : Leadscrew design -- jboggs	Post Reply	Top of thread	Engineering Forum

Posted by: zekeman ® 03/11/2010, 09:21:39 Author Profile eMail author Edit

Agree with previous posts, but if this is a single application you might consider looking into "surplus center", a company that has numerous odd-lot 12VDC and 110VAC linear actuators you can get on the cheap.

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Posted by: skewhole ® 03/11/2010, 18:44:15 Author Profile eMail author Edit

Hi Marky, Attached is my initial design. I will be using the leadscrew(#1/4-28) in my pinch roller system. There will be two sizes(width) of material to be feed in the system so I put a leadscrew to adjust the width accordingly. It does not need to be fast or precise. I tried looking at mcmaster-carr and Nook but found their leadscrew are too long and will need additional machining to fit in a thumbscrew at the end of the leadscrew.

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: : : : : Leadscrew design -- skewhole	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 03/25/2010, 11:50:06 Author Profile eMail author Edit

Is the outer end of that shaft supported in a bearing? What load is on that drum? It is a big ask of the motor bearings. That coupling is a break waiting to happen if there is no outer support. Using a threaded anything as a load bearing shaft is another break waiting to happen. Dave

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: : : : : Leadscrew design -- skewhole	Post Reply	Top of thread	Engineering Forum

Posted by: Marky ® 03/12/2010, 08:00:55 Author Profile eMail author Edit

This looks like a pretty nice design. Try a 1/4-28 set screw....be sure you put in a locking feature such as a 1/4-28 nut to keep the adjustment stable from vibration and people. Don't be afraid to make a custom screw out of threaded rod or an off the shelf screw....you've come this far what's a few more bucks. In the future if you need fine adjust screws try this place. http://www.thorlabs.com/Navigation.cfm?Guide_ID=5

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: : : : : Leadscrew design -- skewhole	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 03/11/2010, 20:48:16 Author Profile eMail author Edit

Check out - http://www.engineersedge.com/gears/screw-axial-thrust-load-calculation.htm

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: : : : : : Leadscrew design -- Kelly Bramble	Post Reply	Top of thread	Engineering Forum

Posted by: skewhole ® 03/15/2010, 22:37:32 Author Profile eMail author Edit

Thanks a lot guys for the valuable inputs. I'm(electronics) not a mechanical engineering graduate but most of my work will require mechanical engineering principle and this site is really big help for me. Thanks again!!! God Bless!

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