[rlwoodjr]

Thanks to Ahren (www.cncrouterparts.com ) who sent me a couple of pieces of 1/2-10 5.

I milled 4 flutes 3/16" wide and 0.1" deep, then tapered the end.

The plastic has a .445" hole drilled into it

[rlwoodjr]

Here is a short movie file showing the results.

The tap is around 6" long. I think I will make one around 12" long.

The process:
I put it in my cordless drill and went forward then reverse until it broke through, then I did it a couple more times.

[johnmac]

You can reduce or eliminate backlash by the exact diameter of drill bit used for the hole. Worked for me.

John

[ahren]

Glad to see it worked out for you! So what now? Are you planning on building a machine? Need any bearing blocks or linear motion components to go with your new drive nut?

Ahren
www.cncrouterparts.com

[rlwoodjr]

Glad to see it worked out for you! So what now? Are you planning on building a machine? Need any bearing blocks or linear motion components to go with your new drive nut?

Ahren
www.cncrouterparts.com

I need to finish the one I am making for dad, http://www.cnczone.com/forums/showthread.php?t=83471
then I am making him a 2 axis for a small wood lathe, then I am making mine so I have quite awhile before I will start on it.

I
Thanks again for the samples...I will have to save some cash to buy some of these acme screws.

[rlwoodjr]

You can reduce or eliminate backlash by the exact diameter of drill bit used for the hole. Worked for me.

John

What size drill did you use?

I was also thinking about freezing the plastic to make it more rigid.

[johnmac]

I was tapping a hole for 3/4x10 and I don't remember now. My first try was too tight and I used a slightly larger bit. I had extra plastic and did some testing on the scrap.

John