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How are you going to accurately attach the nut to the pulley?Originally Posted by homer93
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right im designing a machine out of MDF.
instead of having a rotating lead screw, im wanting to have a rotating lead nut
ive made a design, but im not sure if it will work. or if its too much.
any ideas on what to improve my design?
would it be better to have the bearing in one piece of mdf? so just one nut as well.
ive also missed a collar off, which mounts to the nut, so the thrust bearing is in between the collar and the MDF.
How are you going to accurately attach the nut to the pulley?
i started to think of that just before. tbh i dont really know.
another design i had was a round nut and a pully fit over it, with a cap head or grub screw to tighten it onto the screw. with thrust beariings between the nut and MDF.
You could get one of these timing gears: and set screw it to the nut (if the hole was big enough for the nut to fit in). I've seen bigger pulleys on this site, just needed to find a similar one for picture.
A machine is only as accurate as the tools used to build it. "CNC = Computer Numeric Control - or on some days - CNC = Can Not Control" Imagineering
yeh that was my other design. i can get a pulley and machine the diameter bigger.
but with the size of nut i have found i cant get a bearing onto the nut and be in the MDF.
is it possible to get a really long nut?
Maybe something like this?
"http://www.amazon.com/SteelWorks-Corporation-11846-Threaded-Coupler/dp/B000H5WZB0/ref=sr_1_5?s=industrial&ie=UTF8&qid=1304035341&sr=1-5"]Amazon.com: SteelWorks Corporation 11846/70106 Threaded Rod Coupler Nuts NC: Home Improvement
A machine is only as accurate as the tools used to build it. "CNC = Computer Numeric Control - or on some days - CNC = Can Not Control" Imagineering
I am currently working on a rotating lead nut design. The design has been tested successfully and I am currently working on the patent. Except for one custom milled part, everything else can be user built. Extremely simple. I am looking for a machinist able to work in aluminum or steel. I'm just currently out of money and time to pursue this project on my own. There are a lot of people looking for a product like this, but without help it will be a long time before I can make this available. You will need to sign a non-disclosure agreement. Anyone interested?
You will need AXIAL bearings for that, and you can find cheap ones used in car front wheels, although i wound not suggest using that method since it is quite complicated to make it work with no backlash and no play and for that you would need some type of adjustment to have some preload on the bearings. To date i have seen only one industrial machine use that type of movement and it was on a GEISS 5 axis 2.5x2x1.5 meter work envelope ( to bad the owner doesn't want to sell it since it is rusting outside and it is missing the control board and the spindle, i offered 1500 euros for it but no go).
Also i have seen one DIY here on the forum that uses that but it doesn't mention anything about how he went about building it.
Regards,
Tom
http://www.hossmachine.info/images/z...%20%282%29.jpg
http://www.hossmachine.info/images/c...ed_800x461.jpg
Hoss uses this design for the z axis of his machine. It's pretty simple.
i decided not to bother with my first idea.
used the other easier idea.
i made a 3D model of it. but in still having problems finding a long lead nut.
with what the parts ive been able to find i can buy there is like 1 or 2 mm being held by the bearing in the MDF.
if i could find a pulley that i could screw onto nut which had a flange it would be easier. i would have more area for the bearing to dit on then.
there is two thrust bearings in the design. one uses some washers, which is the smaller one. the other one is just between the pulley and a metal plate. do i need the washers here or not?
thanks
You realize that my 1970's Bridgeport boss uses this design. Good luck with that patent...
does that include the one i just did?
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