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cheers dean,
yes, as you can see, the z is already very slow..besides, if it starts missing steps, it would be on the journey upwards, so i would end up cutting too deep. but it's the other way...

all done
http://i47.photobucket.com/albums/f168/stephane_david/woodwork/_DSC1892.jpg
I managed at least 5h of manchining with no problem whatsoever.
i am still on the washing machine pump, and no...

oh yes, i'll make sure a do that.
still a few things to do before cutting anything though. cooling needs a new pump (washing machine pumps are not powerfull enough), i need to attach a few cables,...

here are a couple
i think you can work things out from those:
http://i47.photobucket.com/albums/f168/stephane_david/woodwork/DSCN9444.jpg
...

been busy redesigning and rebuilding the z axis.
I reversed the setup. rails are now on the moving zplate. this seems to be a much better setup.
...

After a very long break during the summer (bought a new house and moved in, then started sorting out the workshop..), I've just started working on the machine again.
I took the oportunity that it...

Almost !
I do use the same steppers, (2 on x, 1 on z and 1 on y) but i use geckos (G203 i beleive), to drive them.
The PSU is also home built, using a 640VA transformer, diode rectifier, and 50mF...

Cheers !
yes, it's comming along nicely. mostly thanks to your help !

my CNC is nearly complete now:
http://i47.photobucket.com/albums/f168/stephane_david/DSC_1043.jpg
I have all three axis running, and the spindle is almost operational. It requires water cooling,...

all the credit goes to a coleague of mine who described the idea to me.
the clamp is cheap to make, and eventhough it's untested yet, it looks and feel damn strong !
all you need is a piece of...

Ok, i had one more night sleep over it. It must have been a good night.
I worked out where i was going wrong.
The common connection is not common "ground" (otherwise, the G202 does not have any...

I have been twisting my brains on this problem for a while now.
I am not getting any luck with my motors.
here is the setup:
from the parrallel port, onto some 541 TTL signal drivers. from which...

Very nice !

Not much..
I placed an order a few days ago for some allen screws, and some grub screws for the blocks. they havent arrived yet.
i got my hands on a enclosure big enough to contain all my...

cheers, i'll watch for this.

thanks,
oh yes of course, it's not aligned in fact.
I just drilled a 10mm hole on the mount, keeping in mind that that hole would become a 30mm hole in the near future, to be able to take the...

cheers,
I started making a jig for lining things up. as it stands, i am pretty close, but not spot on. i have a difference of about 0.25mm between the screw and the gantry at the front and the rear...

the gantry is up.
not qutie finished, as i still need to install a few reenforcing plates and brackets, but it feels pretty solid already. i cannot feel any racking. I tried pushing on one side...

Of course, i didnt think about that. The caps will remain connected to Geckos G202. They will take care of any charge left over !
oh well.. anyway, a 33k resistor would not work for me.. well it...

I refenforced and painted the machine. looking good an up to the job, so far.
I also started to roughly align the x axis rails.
These will have to be dead symetrical on the supporting beam (at...

why would the supply get damaged at switch on ? it's a basic linear supply with a 640VA transformator, a rectifier, and 50mF of cap. as far as i understand, the voltage is just going to "slowly"...

hi folks,
I am trying to work out the correct sizing for a bleed resistor, which is supposed to empty the capacitors on my home made PSU, as soon as the psu is switched off. Here is what i've got,...

Nice looking machine.
How do you compensate for the uneven floor ?
do you have some kind of adjusting screws in the feet ?

I also have some hiwin equivalent, they look pretty decent quality.
and they are also stiff. they wont coast either.
i have yet to properly test if this is an issue or not, as the gantry is not in...

you have 2 options:
-either you aim at super precision, industrial grade machining, highly repeatable, and durable CNC, for which you are prepared to fork out over 10k, which means you will have to...

Since i have the same screws as Dean (Helmworth Lad), i'll jump in, as i see exactely what he means.
The screws do look cheap. the finish isnt perfect, they just look..well.. cheap..
my guess is...

of course, but it's dimensions will be far greater.
and this is to me, also a factor of concern. dimensions will translate to torque at some point (force x distance).. all a trade off. I tried...

Aluminium is not very stiff compared to steel. compare de young's moduls, i think it's a factor 3 between the two.
Making the y axis the long one is an option, but it's only shifting the problem....

I spent a lot of time trying to answer the question of double vs single screw setup. I have the same concerns regarding the match between the two screws. It still is a theorical concern, i'll solve...

yes, thanks for the comment re shrinkage.. didnt think about that. ok, i need to find a way to get around that problem. maybe filling the post with concrete, let it set/shrink for a few days in the...