Stell frame cnc 1500X1000. Adjustable table your opinion please

[Clive S]

Make sure you let it cure for at least 10 days if you have made a sample mould then when you try and bend the epoxy it should snap like glass and not bend.

Not sure why you need 8mm thick?

[ba99297]

Not sure why you need 8mm thick?

Thanks for your answer Clive
I know that 5mm thick is enough but as i said,"...After having the gantry milled (a process that went wrong) there was a 3mm deep groove for the master rail.

At the first epoxy try the groove had been covered with epoxy so the epoxy had 5mm thickness above the groove and 2mm thickness next to the grove. So this uneven surface may cause the failure of the first try. That is why I decided to go with two layers casts. The first one will cover the big error so that the second one will do the level job better. I don’t remember where, but I had read that in some way the epoxy follows the initial surface and corrects a big part of the surface error, but not all the error.
That is why i choose to cast two layers (4mm each).

[Clive S]

Sorry I did not read your previous post properly. I take it that you are using the epoxy to level two rails up if so you need a moat between them

[ba99297]

if so you need a moat between them

If you see the photos that i upload, i already have made two moats, at the edges of the gantry

They are the white extensions left and right of the gantry
It is like a cyrcle. All the epoxy surface (underneath the rails and the moats) are 50mm wide
Thanks Clive

[reefy86]

Yet another bloody post i spend reading for it to hang dead lol, How did it go for you in the end?

[ba99297]

Big restart after 4 year
This is the second BIG RESTART on a project from 2014. I hope that this will be the last restart
Glad to be back to mycncuk. I have this project running since 2014.
In my last post back to 2017 I was “epoxy leveling” the gantry
Epoxy correct most of the error BUT checking the carriages with straight edge I found out that the rails are twisted (I don’t know if my English are correct). So shims should be used.
I wander if everyone that uses epoxy method ever check the machine against straight edge?

It was a painful process but I learned a lot about shimming
Some photos of my progress till now




Just to remember some basic specs of the machine
Cutting Size 750X1200
Ballscrews x,y axis 2010 z axis 1605
Gearing 1(motor):2(ballscrew)
At first I was planning using three motors (one each axis X,Y,Z) so I bought a set of three Yaskawa servo motors 400 watt, one of them with brake. After many suggestions and advices I finally bought another 200watt Yaskawa for Z so I have
2 X400 watt for x axis (long)
1X400watt (the one with the brake) for Y
1X200 watt for Z
Here is a picture of the motors


My main concern is if 200 watt servo with 1:2 gearing and 1605 ballscrew is enough to handle z axis that is nearly 25-30 kgr (assuming that gearing and ballscrew pitch will 4X the torque of the motor)
Last days i work on attaching the ballscrews so I can mount the motors and see what pulleys and belts I have to order (htd5 15mm wide). Are the Chinese ebay pulleys ok? Do you have any reliable supplier. Do I have something to be carefull. Here is my last progress





So i repeat my questions
#1 Is 200watt servo enough for z axis
#2 Pulleys and belts.a) What to be carefull about, b) reliable supplier

Thanks for your time
Vagelis

[JAZZCNC]

Looking good my friend and welcome back.

To answer your questions then 200W servo will be more than enough to handle 30Kg.

Regards the belts then can't help with suppliers as I buy mine from a local supplier. Most good bearing and engineering suppliers will stock or get you good quality belts and pulleys.

look forward to seeing it move.