Accurate Strong Gantry

[Boyan Silyavski]

What i meant was, lets say it in other words- that if you don't have a machine shop at home or access to one, it seems more easy to do it with 2 motors, cause no money will be saved buying all that stuff from internet, postage, custom bores and so, plus later the very careful alignment. It could pay off if 1 servo instead of 2, money wise, but like you say Dean, servo is the good way to go with 2 motors. So at the end is just a personal preference. I simply don't like that long belts. In reality my small machine works in a lot of dust and never had any problem with the belts.

[JAZZCNC]

So at the end is just a personal preference. I simply don't like that long belts. In reality my small machine works in a lot of dust and never had any problem with the belts.

Yes Boyan it really does boil down to preference and components used not really so much money. My machine doesn't use belts based on money it's soley down to accurecy and repeatabilty/reliabilty within a budget based on using a stepper system.
Any machine using closed loop or some form of error catching setup Ie Servo's/encoders then I wouldn't use single motor and long belts etc.

Regards belt accuracy etc then to any belt/pulley doubters out there then just see this made with a 1300mm wide router with medium weight gantry.!

[vargai]

Hi,
Incredibly detailed piece, very nice done.
The patterns are so sharp even in a mm .
What sort of material is it?

[JAZZCNC]

Hi,
Incredibly detailed piece, very nice done.
The patterns are so sharp even in a mm .
What sort of material is it?

Aluminium 6082T6 cut with a simple 90degree spot drill nothing fancy.

Regards the belts and cutting conditions let me just say my machine 99% of the time it's been built has cut nothing but aluminium and the belts are completely uncovered being exposed to millions of flying sharp and very hot chips so are working in the worst enviroment and I've only ever had to replace two belts. This wasn't because of wear it was because I left a pulley loose which fell off after adjustments for a bracket for sensing belt breakage. (It was a very good real world test of my new belt E-stop.!)
The other I trapped and damaged moving the machine due to not being covered. (So do as I say, not do as I DO, and cover your belts from the start other wise it never get done.!!)

[vargai]

at first sight thought painted wooden, but it cannot be done so sharp

[JAZZCNC]

at first sight thought painted wooden, but it cannot be done so sharp

Yes probably because of poor video done with phone camera.! . . .Looks much better in real life and very shiny.

[Sven]

I have a similar set up just 90 mm wider. I would not do it again, setting it up without backlash is a pain.

Next one wil have a dual stepper, a leadshine easy servo, which is a stepper with encoder.

In this design I would box up the 4 beams so they become one, that is much stiffer.

[vargai]

Silyavski, Dean,

Thanks for the comments.
This is the case when everybody has right.The proof of the pudding is in the eating. Dean likes his pudding and you like yours.
I will do my one and will taste it.
I am going to install two screws anyway and link them with belt-it seems more simple now than two servos-later it can be upgraded

[vargai]

What i meant was, lets say it in other words- that if you don't have a machine shop at home or access to one, it seems more easy to do it with 2 motors, cause no money will be saved buying all that stuff from internet, postage, custom bores and so, plus later the very careful alignment. It could pay off if 1 servo instead of 2, money wise, but like you say Dean, servo is the good way to go with 2 motors. So at the end is just a personal preference. I simply don't like that long belts. In reality my small machine works in a lot of dust and never had any problem with the belts.

I red about dual drive on other sites and heard of several complaints- homing, running faiulre, etc. I also do not say it is wrong rather say it is an elegant solution but like anything it can get out of order.
If it is happens I can not find on heaven and earth in Hungary expert to repair or without being robbed.
So that is way I get closer to the things from the simple side and it will be a future development.