Delta drill press ACME nut

[90cummins]

I’ve been searching for a 3/4”-10 acme nut for the stop on my drill press. The od is 0.745 and threads per inch are 10 as close as I can measure.
Help appreciated
Photo attached.

 

[dadohead]

Delta Rockwell 402-12-068-5001 Knurled Depth Stop Nut for 15" & 17" Drill Press* | eBay

 

[LD1]

3/4-10 is probably not acme threads. Probably just standard threads.

Have you tried just a cheap hardware 3/4-10 nut to see?

 

[dadohead]

3/4-10 is probably not acme threads. Probably just standard threads.

Have you tried just a cheap hardware 3/4-10 nut to see?

My Delta stop rod has an acme thread...

See my post above. Someone on Ebay is offering that very part.

 

[ponytug]

Delta did make, or had made, a wide range of drill presses, and some had some unusual threads, so I would be careful. I know that I have a very similar nut, and it is not ACME threads. The 3/4" ACME size would 3/4-6. On my drill press, the nut is actually two knurled jam nuts with a rubber washer/o-ring between them, as shown in @90cummins' photo.

@90cummins Do you have a model number and an age for your press? I would put the 3/4-10 in the trust but verify category by buying a 3/4-10 nut and see if it fits, as @LD1 wrote above. From a distance, those threads do not appear to be ACME, but I would not put much weight in that.

All the best,

Peter

 

[LD1]

My Delta stop rod has an acme thread...

See my post above. Someone on Ebay is offering that very part.

Yep, I saw the post, and the expensive nut. Doesnt call out what thread it is. And just because the thread looks "flattened" doesnt always mean its an acme thread. If he has the model of the drillpress I am sure it can be sourced

 

[ponytug]

Vintage machinery has lots of manuals and folks who have rebuilt them. I have found it a very helpful source.

All the best,

Peter

 

[dadohead]

Ha... it looks like an acme to me!

I'm on Vintage Machinery alot too. Way more people looking for cheap parts than offering them. So many tire kickers.

If you think $35 is too much, try making one. I have a metal lathe. Cost out an acme tap, straight knurling tool, getting parts plated... he isn't getting rich.

 

[Topzide]

Here's another source; 3/4-6 Acme Hex Nut G & G Mfg 413-1206 | ACME Thread Nuts | ACME Thread Lead Screw & Nuts | Power Transmission | www.surpluscenter.com

 

[dadohead]

OP said 3/4-10 acme

I checked my Delta drill: 3/4-10 acme.

 

[90cummins]

It’s definitely an acne thread.

 

[90cummins]

 

[ponytug]

FWIW: @90cummins if you can knurl it, ACME 3/4-10 round internally threaded is available from the usual folks.
McMaster, Roton, etc. Bronze and steel.

All the best,

Peter

 

[90cummins]

I’m aware that I can work around it, just didn’t think it would be a big deal!
Parts for this old iron is pricey
Thank you for the advice

 

[ponytug]

I’m aware that I can work around it, just didn’t think it would be a big deal!
Parts for this old iron is pricey
Thank you for the advice

Welcome to the club!

 

[LD1]

3/4-10 isnt a common acme thread.

If you can indeed get the direct replacement for $35.....probably well spent.

 

[dstig1]

If that is your photo in the OP, then it sure doesn't look like Acme. 3/4-10 is the stand UNC coarse thread in that size. I'd at least try a cheap stock nut from the farm store first to verify...

 

[90cummins]

I found a 3/4-10 bolt & nut in my catch all pile and put it up to the acme the thread and it is a perfect match at 10 threads per inch and NO the nut does not turn on the acme rod.