Ebay Chinese Routers (CNC3040) - anyone purchased one of these machines recently?

[camhguh]

The spindle has dead, it started to smell really bad and after that (2h of non continuous use) it stopped working, one coil is burnt.

Do you think it was a "refurbished" unit? Is there any sign of wear around the area where the brushes run?

Did the spindle jam on a cut?

[John S]

If you are stuck for a PC I have just bought a job lot, all installed with XP, COA sticker and license, Mach 3 installed and tested [ no license - demo only ] and a few freebie programs like CAD and a DXF convertor

[camhguh]

If you are stuck for a PC I have just bought a job lot, all installed with XP, COA sticker and license, Mach 3 installed and tested [ no license - demo only ] and a few freebie programs like CAD and a DXF convertor

I have lots of pc bits and pieces that we have accumulated through the years John, but if i cannot cobble one together then you might just have the answer

How much are you asking for one of those machines?

[Tenson]

Have you measured the resistance across the coil to confirm it is broken? If it is, then you might be lucky enough to find the break and solder in a bit of new wire. However that is probably hoping too much as the wire has enamel on it to stop it shorting to the other strands next to it, and if it got hot enough to brake, then the enamel around that wire and others near it will also be melted. You will have a number of shorted turns. Anyway you might manage a repair but most likely to need a replacement.

... if you do, can I have the broken motor?

[modcube]

Have you measured the resistance across the coil to confirm it is broken? If it is, then you might be lucky enough to find the break and solder in a bit of new wire. However that is probably hoping too much as the wire has enamel on it to stop it shorting to the other strands next to it, and if it got hot enough to brake, then the enamel around that wire and others near it will also be melted. You will have a number of shorted turns. Anyway you might manage a repair but most likely to need a replacement.

... if you do, can I have the broken motor?

Yes, I measured the resistance to confirm it's broken. As you mentioned it seems it has melted so it can be very difficult to fix. I will contact the eBay seller (love-happyshopping) and I'll try to get a new one (the product page says: "1 years free warranty"). I'll keep you posted.

[John S]

That's a bummer but at least it will give us an insight into how good the warranty / claim setup is from the Portsmouth guys if you can keep us in the loop ?

[Musht]

Think thats where some of the saving is, spindle on mine have had the brushes previously changed with too big a screwdriver.

Spindle driver circuit is on the very basic side, it will allow the motor to stall at low revs and has no back emf protection at all.

Hope your vendor is responsive, please do keep everyone informed.

Cheers
Adam

[Tenson]

Think thats where some of the saving is, spindle on mine have had the brushes previously changed with too big a screwdriver.

Spindle driver circuit is on the very basic side, it will allow the motor to stall at low revs and has no back emf protection at all.

Hope your vendor is responsive, please do keep everyone informed.

Cheers
Adam

Care to share a picture of your spindle drive circuit? :)

[Musht]

Care to share a picture of your spindle drive circuit? :)

will get some lid off shots tomorrow :-)

[Musht]

Lid off pics, Yoo CNC controller:


spindle control;
Device numbers been scrubbed off the two power trannys, it does the job of controlling speed but a decent D.C. drive or change to VFD spindle somewhere down the road.

Paralell in breakout, now know why E-Stop does nowt, its physically connected to the probe pins ;-)
Being brought up on usenet not hugely fond of v-bulletin ,seem to jump from needing approval to not, to posts awaiting approval, dunno about spam situation but it don`t encourage new posters...

Cheers
Adam