New ACME nuts from DumpsterCNC and CNC Router Parts

[ahren]

Hi all,

I just put a post in the product announcement section, but since those scroll by so quickly I thought I'd cross-post to interested parties here. I've been working with Tim at DumpsterCNC, and together we've come up with what we both think will be a nice new addition to the DIY CNCer's toolbox. We've integrated a custom version of Dumpster's super-slick anti-backlash mechanism with CNC Router Parts convenient right-angle, low-profile mounting configuration in a rugged aluminum holder. The Dumpster units thread into the holders, and a metal jam nut locks them in place for a solid linear motion drive component. These units have significantly more backlash compensation and higher load capacity than our old style nuts, and we're happy to now have DumpsterCNC's technology in our parts!

These units are on sale now in a 5 start configuration from CNCRouterParts, with more potential configurations coming soon.

Best regards,

Ahren
CNCRouterParts

[louieatienza]

Ahren that is way cool! I have a few project in mind where I could use that for sure!

[Drools]

Ahren is there any way an existing user of DumpsterCNC nuts can modify the Dumpster nut to fit your mount or do we have to purchase the complete unit?

[DonFrambach]

Looks great. As soon as you have single start available, I'll purchase one!

[ahren]

You'd have to check with Tim on modifications to the existing nuts -- it would require some fancy lathe work, which is why we partnered with Dumpster in the first place

Best regards,

Ahren

[Drools]

hopefully at some point we can purchase the unit seperately. It would help the upgrade path get a little shorter if someone had your mount they could purchase the nut required from Tim?

[ahren]

Drools, I'm not sure I understand. Both the nuts and the mounts are new parts, so you would need both to get a working unit. Tim can produce the nuts in any of his standard ACME configurations (single start, two start, 5 start, etc.), and we're happy to sell the mount separately if you want to go that route.

Best regards,

Ahren
CNCRouterParts

[dmiller47591]

So the mounting holes and screw center height (from base) dimensions are the same as the origianal CNCRP right angle nut?? If so that's great.

[CarveOne]

From the CNCRP site "The unique spring mechanism on the nuts provides for miles of backlash-free linear travel". But Ahren, my machine isn't that long. (YET)

Can one of these support the 11 pound weight of the Porter Cable 7518 3-1/4 hp router on a 5 start screw without undue wear? I haven't installed my PC 7518 yet. I was considering using two of DumpsterCNC's version back to back on one lead screw screw and changing to a higher torque step motor on the Z axis.

Also, can one of the internal delrin nuts be rotated in its aluminum block to exactly align the mounting faces of the two aluminum blocks when two are in series on the same lead screw? If yes, I would probably do that when I build a new Z assembly. If not, they would bind on the lead screw when bolted to the same mounting plate.

A 2x longer delrin threaded insert with a block on each end might be useful as a custom option for these heavy routers. I suppose that would be something with too low of a sales volume to justify it though.

The new design looks good.

CarveOne

[alan_3301]

Ahren good choice on using the dumpster nuts, they have worked great on my machines in the past. I will be ordering one. Maybe you should also stock their threaded shaft collars. I am having problems with the metal smooth bore shaft clamps included in your kit. No matter how tight I get the locking bolt, it still slips on the leadscrew after the 1st jog. The threaded dumpster design staying in the exact same spot after 2 years of use.

[dumpster]

Ahren is there any way an existing user of DumpsterCNC nuts can modify the Dumpster nut to fit your mount or do we have to purchase the complete unit?

Ahren is right, it would be difficult to modify the existing flanged leadnut for use in the new mounts since the new nuts are quite longer to allow for the 3/4-16 threads that screw into the mount.

Tim

[dumpster]

CarveOne: The 11 pound router shouldn't be a problem for a single leadnut, although using 2 leadnuts back to back will obviously make it stronger. The nuts can't be rotated in the mount since they screw in and have the added security of the jamb nut to lock them in. To get 2 leadnuts lined up properly, you'd need to be able to shim between them to get the correct distance. A pair of slots in the mounting plate would allow you to adjust one of the mounts in either direction.

BTW, my machine isn't miles long either, I had to make 2 passes!

Tim