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View Full Version : Tapping Delrin for M10 threaded rod - doable?



HankMcSpank
08-09-2008, 01:10 AM
So I hear everyone recommending using Delrin nuts as a cheap alternative to ballscrews for it's unique properties as a lead screw nut.

I see very few (if any) mention making a delrin nut for say M10 threaded rod ....why not?

20mm diameter Delrin rod seems cheap...it's not exactly HSS, so should be easy to tap...has nobody tried?

Comments?

Lee Roberts
08-09-2008, 03:28 AM
Yea get yourself some and a Tap and go for it, its really easy. I would suggest going for a block type nut tho as mounting a round nut is a little bit more tricky, below is some pics of the ones i make for use with M8 Threaded Rod:

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04762.JPG

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04765.JPG

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04775.JPG

http://www.mycncuk.com/forums/photoplog/images/2/medium/1_DSC05046.JPG

http://www.mycncuk.com/ebay/images/delrin_nuts/DSC05116.JPG

The above is how they look in my ebay shop for 4.99 each !

Lee Roberts
08-09-2008, 03:35 AM
As you get on making them you will find you get better and better as you go, the first ones i made the rod was a bit lose but after making about 300+ to sell on ebay i got them down to a fine art, you will need to get the right size drill bit to bore your hole, see if you can get a kit with both the drill bit and the Tap.

You will need to do a good job at getting the hole center and strate as well, again its tricky but i make these with hand tools and a vice so im sure you will be ok just take your time, post up a pic once you'v made one.

I'v seen loads and loads of DIY machines use delrin as the drive nut, even the top dogs who can machine ali use a delrin insert and so im told some gearbox's use delrin as well.

Good Luck !

CM

HankMcSpank
08-09-2008, 01:15 PM
Thanks for your comments...you make a good point about using delrin block vs rod.

Where's the best place to source Delrin block? (I can only find Delrin rod on Ebay)

Lee Roberts
08-09-2008, 04:24 PM
Thanks for your comments...you make a good point about using delrin block vs rod.

Where's the best place to source Delrin block? (I can only find Delrin rod on Ebay)

How much do you want, i have got a fair bit laying around i could send you. Mostly already cut up into blocks like the pic in the link below ready to be drilled/tapped.

The size of the blocks more then recive an M8 tap with no problems, i dont think you would have any problems using them for an M10 tap i will have a look in a mo for you!

Please see this link: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=250235119898

Lee

HankMcSpank
08-09-2008, 05:05 PM
I'm not even sure whether I'm using M10 or M8. I bought some M8 rod from Screwfix...it was woeful wrt being straight (& it's going back!)

I figured going up a notch in diameter might help on the straightness, but I'm still wavering on the extra work (friction) it'll cause my feeble steppers (taken from discarded dot matrix printers)

Just to put you in the picture...this will be my first CNC build. The plans are in my head...it'll be an evolution...it'll also be rather small (mainly because I have 6 free steel rods - with bushings- that are only 12" in length).

I'm aiming to do this as low cost as possible (as I'm sure to make mistakes), build 2 - if I ever get there - will be when I throw a bit more money at it. Looking at your blocks they seem a little small in comparison to the ones cheekymonkey linked to...I'd envisaged using blocks a little larger (just to spread the connectivity points wider into the table base).

With the above in mind, I'd be grateful for anyviews on..

1. M8 vs M10 rod.
2. Whether it matters one tot going stainless steel vs zinc plated steel.
3. Whether one delrin block or more is used per axis ...if so, is it better to use slightly larger blocks or not?

I'd already emailed this seller...

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=150260473130&ih=005&category=26258&_trksid=p3286.m7&_trkparms=algo%3DLVI%26its%3DK%252BD%252BC%26otn%3 D1%26ps%3D5

As his Delrin block looks like the size I'd envisaged...also because it's dirt cheap (which appeals to the unfeasibly tight side of me)

Lee Roberts
08-09-2008, 07:57 PM
I figured going up a notch in diameter might help on the straightness, but I'm still wavering on the extra work (friction) it'll cause my feeble steppers (taken from discarded dot matrix printers)

Just to put you in the picture...this will be my first CNC build. The plans are in my head...it'll be an evolution...it'll also be rather small (mainly because I have 6 free steel rods - with bushings- that are only 12" in length).


I think i would use some M6 if the machines going to be that small.


I'm aiming to do this as low cost as possible (as I'm sure to make mistakes), build 2 - if I ever get there - will be when I throw a bit more money at it. Looking at your blocks they seem a little small in comparison to the ones cheekymonkey linked to...I'd envisaged using blocks a little larger (just to spread the connectivity points wider into the table base).

I am CheekieMonkies, the blocks i posted there are 50x50, the blocks on the link to ebay are 50x20mm, the ones i posted as cheekiemonkies are the first ones i ever made, i ended up halfing the size on them because i didnt notice much diffrence it how much connectivity was going on.


Whether it matters one tot going stainless steel vs zinc plated steel.

Go with stainless steel !


3. Whether one delrin block or more is used per axis ...if so, is it better to use slightly larger blocks or not?

Using 2 nuts you find they resist each other.

I have also used "CockRam" befor, hes quite good.

Lee

henser
02-02-2013, 12:31 AM
Yea get yourself some and a Tap and go for it, its really easy. I would suggest going for a block type nut tho as mounting a round nut is a little bit more tricky, below is some pics of the ones i make for use with M8 Threaded Rod:

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04762.JPG

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04765.JPG

http://www.mycncuk.com/forums/photoplog/images/4/medium/1_DSC04775.JPG

http://www.mycncuk.com/forums/photoplog/images/2/medium/1_DSC05046.JPG

http://www.mycncuk.com/ebay/images/delrin_nuts/DSC05116.JPG

The above is how they look in my ebay shop for 4.99 each !

Hi Lee ...

sorry to dig this old thread but i wanted to know if you still sell the Delrin Nuts for M8 threaded rods?

if so please link me to your ebay store or item ... if you don't sell them anymore please link me to some sellers or tutorials on the subject you may know.

thanks in advance

Best,
Hensser