Major? Spindle play

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But presumably you have not yet studied the illustration of the motor

MichaelG.

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Edit: __ There is a downloadable manual on the EU web page ... But still no exploded diagram 

Edited By Michael Gilligan on 03/05/2023 13:02:11

I would not worry too much about the photo, Vevor regularly use ones not related to the actual item.

There are a few more examples on the net not just the Aliexpress one I have mentioned and all look to be able to pass a decent size workpiece through the spindle (assumeing images are correct.) some of the the 8x16 lathes also seem to have this direct motor

I tend to think that if this machine was used 'as is' it probably wouldn't last more than three years. But what fool would just use it as-is? (Probably many).

Yes, I'm thinking about the refund option. But honestly, I'm still thinking about this as a project like "How to (re)Build a Lathe". I knew it would need some serious work when i bought it. It's just too cheap to be well manufactured and built. I was fully intending to do some extensive work on it. To it. I have a vertical 'milling attachment ' for it (and some dovetail cutters) and was going to start with the gib strips. There's plenty of vids on upgrading and repairing mini lathes and i think it would be a Really satisfying project. I know it might take a while, and some money, but those are things im happy to invest as i can.

Im sure there will be people telling me im mad ...but that's always been the case. If you All tell me so, ill rethink my approach.

Aside from that, i think the motor is in the box behind the spindle head. As i recall, it hes cogs but not a belt driving the spindle (not the lead screw gearing cogs). Ill double check when i get out of bed.

For now, this is just too frustrating trying to type this on a phone. Ill writmore in about twelve hours or so.

Thanks all.

I can't find who suggested it, but all play disappears when i mount the dti on the headstock (very tight fit, though).

My apologies if I've wasted anyone's time. At least a valuable lesson has been learned.

I'm going to unscrew the cover plate from the back of the (apperent) motor box and satisfy all questions about where the motor actually is. There are no evident gears driving the spindle, so we'll see if that's all internal or if its a spindle motor. Back in a while.

Thanks again, all.

I can't find who suggested it, but all play disappears when i mount the dti on the headstock (very tight fit, though).

My apologies if I've wasted anyone's time. At least a valuable lesson has been learned.

I'm going to unscrew the cover plate from the back of the (apperent) motor box and satisfy all questions about where the motor actually is. There are no evident gears driving the spindle, so we'll see if that's all internal or if its a spindle motor. Back in a while.

Thanks again, all.

It might be an idea to post some photos of where you are placing the DTI and where is shows movement.

Bill

Yeah, I'll take a pic, Bill. Basically, though, it was showing movement when the dti was on the base-tray (which I thought was stable). Evidently there is significant movement when placed there so I have learned to not trust my assumptions about the stability of things and to always use the most solid mount for a dti, then check it is good.

I feel like a bit of a fool but I guess we all do stupid things when we are starting out.

Incidentally (for anyone interested) the motor is definitely mounted IN the spindle housing, around the spindle. Much like the photo posted yesterday of one from Ali.

Make something, and see where it goes to your liking. Then try to figure out what went wrong where and why. As a bonus you gain experience.

A practical measurement is with the DTI on the tool post. It's movement between tool and workpiece that matters.

B.T.W this happens a lot in electronics. Peope think any old but of bare metal is OK to use as a "ground" refrence for measurements......

Yep sounds like you were just rocking the lathe on it's flexible drip tray, Headstock , bed or cross slide would all be reasonable places to mount the Dti for that test

Thanks for confirming the motor is wrapped around the spindle, if you have time a few photos with the end cover removed would be interesting as would a short video.

Not wasted my time! The valuable lesson here is that it is tricky to do tests on machine tools that measure one parameter, and one parameter only. It is common on here to see a measurement made, and solutions sought, for a problem that doesn't actually exist. It is best to make a series of measurements, with an open mind, and find a cause, before contemplating "solutions".

Andrew

Thanks Andrew.

But.... photo's...

Given its size, I thought the motor must be in the big box at the rear...

But no, it was empty,,,

It seem the motor is, in fact, around the spindle...

another angle...

Small, isn't it? (let's hope it lives up to its hype).

Such a compact "800W" motor, yet no cooling provision - do they use the headstock casting as a heatsink ?

Could you confirm how many wires are contained in the cable from the motor. What passes for an electrical diagram in the EU Vevor "manual" only shows 2 wires to the motor, but I would guess 3 or 4 (3 phase motor with maybe an eath direct to the stator).

Nigel B.

As it is a brushless motor more likely to be 7 or 8 allowing for the sensors etc. Probaly run as two cables one for power and another for control, 4 cores to each.

Edited By JasonB on 04/05/2023 10:31:29

That's a much better and more efficient way of learning about your new machine than making decisions based on measurements you don't understand. I've never put a DTI near the spindle of either of the lathes I've owned, although I do spend some time fiddling with the change gears to get them to run quietly...