Denford Easimill restoration and upgrades

[JAZZCNC]

I've got a 700mm total length 25mm x 10 Ground Comtop with soft ends ready for machining which I think are C3 if not then Def C5 which I bought from Jenatec years ago. I've actually got 3 in total all different lengths, this is shortest, others are 950, 1100mm the longest one got a preloaded double nut. I Will sell them as a set for £300 + shipping.

[Jonathan]

Are you planning on putting a braked motor on the knee?

For now I just have a 12Nm stepper that's been kicking around. That's plenty to hold it while switched on so I guess there's not much call for a brake? There is a rear shaft on the motor, so I could probably devise something.

I've got a 700mm total length 25mm x 10 Ground Comtop with soft ends ready for machining which I think are C3 if not then Def C5 which I bought from Jenatec years ago. I've actually got 3 in total all different lengths, this is shortest, others are 950, 1100mm the longest one got a preloaded double nut. I Will sell them as a set for £300 + shipping.

The ballscrew lengths that the machine currently has are X=936, Y=452 and I'm planning Z=585mm, so your set would be close to ideal except I'm not quite convinced by them being 10mm pitch as opposed to 5mm. Do you have the part number for the ballnuts to hand so I can compare their stiffness values?

[JAZZCNC]

Do you have the part number for the ballnuts to hand so I can compare their stiffness values?

Comtop
700mm = 080317065
950 = 061012060
1100= 0060927033

[Jonathan]

Comtop
700mm = 080317065
950 = 061012060
1100= 0060927033

I'm struggling to find anything based on those part numbers, but if I compare with TBI datasheets then it seems that higher lead screws actually have slightly stiffer ballnuts. Perhaps it's the larger diameter balls.

I still prefer 32mm for Z though, so I've just bought one from Aliexpress:

https://www.aliexpress.com/item/4000...3d073e5fnZZMYt

It was $132 plus $4 for the three extra nuts. I'll get back to you if when I've got the machine back together I'm not happy with the accuracy on X or Y. Thanks for the offer.

Instead of spending money on ballscrews, these encoders look wortwhile:

https://www.rls.si/en/la11-linear-absolute-encoder

That and closed loop position control through LinuxCNC would be very nice. About 370 EUR per axis though, so I need to do a bit of research first...

Now I've just gone to the local builders merchants and filled my car with wood and insulation. Going to make the workshop nice before I get too carried away .

[JAZZCNC]

I'm struggling to find anything based on those part numbers, but if I compare with TBI datasheets then it seems that higher lead screws actually have slightly stiffer ballnuts. Perhaps it's the larger diameter balls.

I still prefer 32mm for Z though, so I've just bought one from Aliexpress:

It was $132 plus $4 for the three extra nuts. I'll get back to you if when I've got the machine back together I'm not happy with the accuracy on X or Y. Thanks for the offer.

A lot of modern CNC mills like Haas have 10mm pitch screws so makes sense along with extra speed they offer.!

They are going nowhere so just let me know if change your mind. They will eventually end up on a Mill or router at some point.!