operation cnc

[Wobblycogs]

I'm glad to see that I'm not the only one worrying about how accurately the machine has been put together. I've just (mostly) finished one side of my frame so I've done a quick test fit. The bed rail and the guide rail are 0.1^o out of parallel. Doesn't sound like much but that equates to just over 3mm over the total length according to my calculation :-(.

It's looking great though KC, keep the good work.

[Swarfing]

Dog with bone?

[kingcreaky]

Ok... so where do I buy a long belt from? the distance between screws is approx (i need to measure) 1.1 meters. So assuming im looking at 'Pitch Length' I need one approximately 2.2 metres?

maxium i can find is about 1.8 metres (1870mm)

im not bothered what 'pitch' it is etc, so long as its a timing belt. once ive found one il buy pulleys to suite, then bolt my existing stepper drive pulley to the ballscrew pulley (ala jazz)

[JAZZCNC]

If you go to any decent bearing and belt supplier you can have belts made to any length you want, thats what I did. Cost be about £15+vat if I remember correct.

[Swarfing]

Sorry just re read and you want the belt to cross the screws. Give ERIKS in Swindon a call

Address: Unit 2/Ravenseft Pk/Cheney Manor, Swindon SN2 2QP
Phone:01793 533181

The do belts of any size within reason and i found them to be the cheapest at the time.

[kingcreaky]

had one of them nights tonight... first off dropped the ballscrew and bent the end



so, decided to fire up the big heavy green machine in the corner. I should perhaps at this point explain that the machine is jinxed. Every single time I use it, it ends up either hurting me, or my wallet

so spun it up.. the other end whipped round like a b*stard, I grabbed the ballscrew before it killed the dog and...



thats the tidy version... (all those bearings went everywhere... for a moment, it was like a scene from home-alone)


so, after a few beers of contemplation, and a motivational chat with jonathon on skype I formulated a plan...




better. Not quite jonathon standard of engineering, I agree but much straighter.

So being an 'engineer' :D now. I decided to use this useful bit of kit too bore the holes in my pulleys



decided to come up and finish my beer in the house before I broke anything else

[GEOFFREY]

Better change your name to wobblycogs, oh no - too late!! have a better day tomorrow. G.

[JAZZCNC]

better. Not quite jonathon standard of engineering, I agree but much straighter.

Oh I don't now looks about the same standard to me.!! . .

[Swarfing]

Why can't you use open belt? the gantry has to be fixed to one side of it any way?

[wilfy]

so spun it up.. the other end whipped round like a b*stard, I grabbed the ballscrew before it killed the dog and...



thats the tidy version... (all those bearings went everywhere... for a moment, it was like a scene from home-alone)

i'm sorry but this has had me pretty much pissing myself everytime i read it... i just cant keep a straight face when i read over it and i think i've done so 5 times now..

i'm such a bad person.. and whats funny... i know damn right i'm gonna lose them balls one day