Upgrade? Chinese CNC Machine

[Carlb1058]

Well that didn't take long, got my 3 x 542's and new bob ready to get set up but needed to knock out a couple of plaques before I tore it down and spent the next few weeks trying to work the wiring out. On the 2nd plaque it started to double line again so I thought the coupling had come loose, but no I have to be different and snap the bugger on the X axis completely *groan* gets wots ya pays for, now to find new DECENT couplings.

Info and piccies posted here http://www.mycncuk.com/forums/tradin...couplings.html hopefully it's the right board. . .

[John S]

Replied in that forum but it is the wrong place, only the original poster can post there. Everyone one else doesn't get a post reply button.

Anyway to keep it all in one place here's my reply.

This coupling question often gets asked.

There is only one design of coupling that can handle misalignment in two axis and still work. That is an Oldham coupling.

http://www.mekanizmalar.com/oldham.html

If you were in the UK I'd say Farnell, CPC, RS or Arc

The 2, 3, 4, jaw Lovejoy type couplings whilst being cheap are not zero backlash or able to handle misalignment in both axis.
The type you have I hate with a vengeance and is about as much use as a stick of celery and two hose clips.

REPLACE ALL THE COUPLINGS.

[Carlb1058]

Ta for the info - I'll see what I can find here but not holding me breath!! Oh and seeing how cheap n cheesy this one is I was going to replace all and double up too just in case.

Oh well, while I wait it'll give me time to read the wiring docs for this new setup *shudder*

[Carlb1058]

bonus a local Buy Oldham Style Coupling Hubs Clamp oldham coupler,8mm ID 25mm hub Huco 452H25.28 online from RS for next day delivery. roughly 120 quid for X,Y,Z

[tumutbound]

Also available at Farnell (Element 14)

[John S]

bonus a local Buy Oldham Style Coupling Hubs Clamp oldham coupler,8mm ID 25mm hub Huco 452H25.28 online from RS for next day delivery. roughly 120 quid for X,Y,Z

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Fück me when we shipped all the crooks out to OZ there was no need to keep all the bastards.

[Swarfing]

Christ? i paid £3.50 each off fish4parts, good while ago i know but can't believe they go up that much?

[Philly]

I use these cheap jobbies: 8x8mm CNC Motor Jaw Shaft Coupler 8mm To 8mm Flexible Coupling OD 20x26mm # 02 | eBay

even bought a spare set which I haven't had to use :)

[Carlb1058]

Christ? i paid £3.50 each off fish4parts, good while ago i know but can't believe they go up that much?

Checked a couple of local sites/companies and the prices are pretty similar so either they import container loads (doubt that) or the UK manufacturer sticks it to 'em on wholesale or they're all just twonks in it for the money with a captured market - either way I need something that's not gunna break at the sight of pine and I would like to have a go at light aluminium one day too

[Carlb1058]

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Fück me when we shipped all the crooks out to OZ there was no need to keep all the bastards.

ROFL how true - it's easy to get stiffed big time for plenty of different things here and the politicians wonder why people buy stuff O/S