Nema17 motors driving 1204 ballscrews ...that ok?

[ptjw7uk]

If the machine moves now with standard screws then it will be easier to move with any ballscrew.
Will there be enough room for the ball nut!
Have you thought of smaller ballscrews 10 mm!

Peter

[Swarfing]

Hank 1204 will be fine but you will need to mod the Z plate to take the Ballnut by the looks of it?

[HankMcSpank]

Thanks guys

Hank 1204 will be fine but you will need to mod the Z plate to take the Ballnut by the looks of it?

I haven't taken the Z backplate off to have a look, but I think the X axis ought to take a 1204 ballnut (which according to the spec sheet - http://images.tiu.ru/22699355_w640_h640_sfu1605.png ...top entry, not the highlighted entry in that table!), should fit...



Can anyone tell me the difference between a 1204-3 & a 1204-4? (& no smart replies saying 1 please!)

I think I'm gonna stay with this machine a little while longer, cos yesterday I found & ordered a dedicated spindle which looks like it suits my needs (& until yesterday I didn't even know existed)....




a video of it in action (spindle porn!)...



the spiindle, motor & mounting plates (everything in the picture) only totals £66 plus £15 delivery - which to me seems very keenly price (nice & quiet too...and 10,000RPM ought to be enough - my present spindle only goes up to 5,000rpm)...so I pulled the trigger & should have it in about 10 days.

[Swarfing]

Great news sounds like it is all working out in the end. Will you stand the stepper off so that you can get a support bearing in there?

[HankMcSpank]

I think the Z axis is gonna be a challenge (it doesn't appear to be the same as the X axis & not sure I can fit an sfu1204 ballnut in there at all :-( )

[Swarfing]

Is there space between the linear bearings? could always make a new block up so as not to ruin the existing.

[GEOFFREY]

That spindle assembly looks really good and excellent value. I can't comment about the noise as I can't hear it!!!(only the cleaner). G.

[HankMcSpank]

That spindle assembly looks really good and excellent value. I can't comment about the noise as I can't hear it!!!(only the cleaner). G.

Ironically, having just bought asbo's 300W spindle (which is a surprisingly fine spindle type for the price) ....the one I've now just gone and bought afterwards (above) looks to have exactly the same driving motor on it - they are just gearing up the motor's RPM with the pulley (I note they quote the motor at 24V vs. "upto 48V" that the 300W spindle motor is normally spec'ed for - I guess the spindle that the motor is driving only has modest bearings & wouldn't cope well with RPM above 10,000RPM - actually, perversely, I'm hoping the spindle *doesn't* use ceramic bearings & therefore the spindle shaft might be groundable - is that a word?)

Re the noise...as someone who mainly mills PCBs, I'm a sucker for a quiet spindle, and yes it's very quiet, which is why I pulled the trigger so quickly (the seller had sold 4 & only had one left)...only last week, I was comtemplating water cooled spindles, but I'm pleased I didn't now...I really don't need the extra grunt (& complexity/weight) that it yields.

Is there space between the linear bearings? could always make a new block up so as not to ruin the existing.

It's all too easy to reason that most members on here are of a solid engineering background ilk...I'm not - really small children laugh loudly at my output (I often hear them muttering things like "FFS, that bloke should have used angular contact bearings on his Z axis"...I have no idea what they're going on about).

I'm a reluctaant CNC'er ...I potter along blindly, then hit a problem ...& spend way too long trying to find an inadequate solution! (whereas, I'd much rather be playing my guitar & gulping on a cool one)

[Swarfing]

LOL! Hank no inference from me on that score, firm believer in you can only do what you can only do :-)

[GEOFFREY]

LOL! Hank no inference from me on that score, firm believer in you can only do what you can only do :-)

My belief is that you can do anything if you really want to and are prepared to put time and effort into it. I will be 70 in august and would like to think that I learn something new every day. Probably left it to late to become a brain surgeon now, but I don't really want too!!! G.