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bianchi
04-26-2012, 10:28 AM
Hello Guys,
Do you know how to create lead nut ?
DIY lead nut ?
I saw cylinder nut, but not sure it will stay there even I clamp and glue it...
any ideas ?

thanks a lot

OCNC
04-26-2012, 11:09 AM
Hello Guys,
Do you know how to create lead nut ?
DIY lead nut ?
I saw cylinder nut, but not sure it will stay there even I clamp and glue it...
any ideas ?

thanks a lot

What kind of screw is it?

bianchi
04-26-2012, 11:32 AM
What kind of screw is it?
I'm using long rod screw, I want to use hex nut as a lead sticking to x,y,z plate,
I created prototype with balsa wood, hex nut and hot glue, as in the photo...
I can make a clamp with nail screw on it..so the hex screw will be anchored into the plate
http://i129.photobucket.com/albums/p231/picture_77/26042012278.jpg

http://i129.photobucket.com/albums/p231/picture_77/26042012279.jpg


Any more ideas ?

Thanks

bianchi
04-26-2012, 11:34 AM
any ideas on how to drill the screw so I can attach the shaft of my stepper motor ?
special drill bit ?

Deep Groove
04-26-2012, 11:53 AM
You need to look into couplings to connect your motors to your shafts. There are many varieties, each with their own advantages and disadvantages. They range from a small (1" or so) piece of flexible tubing clamped on each shaft to precision couplings that may run MANY dollars.
Many are available that will connect differing sized shafts conveniently.

I'd suggest looking at some of the common CNC suppliers mentioned on here such as CNCRouterParts.com or HobbyCNC.com for your hardware needs. You'll find there's many, many ways to do things.



:)

jckstrthmghty
04-26-2012, 02:24 PM
I'm using long rod screw, I want to use hex nut as a lead sticking to x,y,z plate,
I created prototype with balsa wood, hex nut and hot glue, as in the photo...
I can make a clamp with nail screw on it..so the hex screw will be anchored into the plate

Any more ideas ?

Thanks


I don't think using a steel nut is a leadnut is a good idea. There will be a lot of backlash that will continually get worse as the metal on metal causes wear. You can make leadnuts from cheap HDPE if you have access to a tap. You can even make a tap from a spare piece of threaded rod or you can use the melting technique to make leadnuts.

If you must use a steel nut you won't need any glue. You can drill a hole slightly smaller than the external nut size and screw the nut into the wood. Use a large washer on the other side to prevent both sides from embedding into the hole.

Hope that makes sense.

bianchi
04-26-2012, 07:23 PM
You need to look into couplings to connect your motors to your shafts. There are many varieties, each with their own advantages and disadvantages. They range from a small (1" or so) piece of flexible tubing clamped on each shaft to precision couplings that may run MANY dollars.
Many are available that will connect differing sized shafts conveniently.

I'd suggest looking at some of the common CNC suppliers mentioned on here such as CNCRouterParts.com or HobbyCNC.com for your hardware needs. You'll find there's many, many ways to do things.



:)
do you have photo for this coupling method?

jckstrthmghty
04-26-2012, 07:28 PM
A search for "lovejoy couplers" on google images returns many good examples

bianchi
04-26-2012, 07:30 PM
I don't think using a steel nut is a leadnut is a good idea. There will be a lot of backlash that will continually get worse as the metal on metal causes wear. You can make leadnuts from cheap HDPE if you have access to a tap. You can even make a tap from a spare piece of threaded rod or you can use the melting technique to make leadnuts.

If you must use a steel nut you won't need any glue. You can drill a hole slightly smaller than the external nut size and screw the nut into the wood. Use a large washer on the other side to prevent both sides from embedding into the hole.

Hope that makes sense.

do you have HDPE photo example ? thanks

bianchi
04-26-2012, 07:56 PM
A search for "lovejoy couplers" on google images returns many good examples
with coupling is not 1:1 rotation to motor isn't it ?
and how to connect the lead screw with sprocket ? since it's threaded rod ?

bianchi
04-27-2012, 08:57 AM
I don't think using a steel nut is a leadnut is a good idea. There will be a lot of backlash that will continually get worse as the metal on metal causes wear. You can make leadnuts from cheap HDPE if you have access to a tap. You can even make a tap from a spare piece of threaded rod or you can use the melting technique to make leadnuts.

If you must use a steel nut you won't need any glue. You can drill a hole slightly smaller than the external nut size and screw the nut into the wood. Use a large washer on the other side to prevent both sides from embedding into the hole.

Hope that makes sense.
Like this one :
http://i129.photobucket.com/albums/p231/picture_77/plastichexnut.jpg

OCNC
04-27-2012, 09:30 AM
Like this one :
http://i129.photobucket.com/albums/p231/picture_77/plastichexnut.jpg

If you take two nuts like that and sandwich an O-ring between them and put them on the threaded rod you can remove any play by turning them slightly against each other to compress the O-ring. This will eliminate backlash. Then drill an oversize hole in a small block of wood and secure both of them (while still on the rod) in the hole using some epoxy. This will lock them together relative to each other and the fixing block. The assembly then becomes a lead nut and support block that can be mounted to the machine as required.

Chris

bianchi
04-27-2012, 09:57 AM
If you take two nuts like that and sandwich an O-ring between them and put them on the threaded rod you can remove any play by turning them slightly against each other to compress the O-ring. This will eliminate backlash. Then drill an oversize hole in a small block of wood and secure both of them (while still on the rod) in the hole using some epoxy. This will lock them together relative to each other and the fixing block. The assembly then becomes a lead nut and support block that can be mounted to the machine as required.

Chris

should I put super glue between : nut -> O-ring -> nut before I compress them together?
I got the idea on how to connect stepper and threaded rod, with coupler,
http://i129.photobucket.com/albums/p231/picture_77/coupler.jpg

Is this one the same with lead nut ?
http://i129.photobucket.com/albums/p231/picture_77/leadnut.jpg

From the name I saw : Linear Ball Bearing Slide , is it the same with lead nut ?

bianchi
04-27-2012, 10:02 AM
should I put super glue between : nut -> O-ring -> nut before I compress them together?
I got the idea on how to connect stepper and threaded rod, with coupler,
http://i129.photobucket.com/albums/p231/picture_77/coupler.jpg

Is this one the same with lead nut ?
http://i129.photobucket.com/albums/p231/picture_77/leadnut.jpg



From the name I saw : Linear Ball Bearing Slide , is it the same with lead nut or this one is the slider?

bianchi
04-27-2012, 10:04 AM
If I use 5mm coupler, I should use exactly 5mm threaded rod too ?