Stell frame cnc 1500X1000. Adjustable table your opinion please

[Davek0974]

That sounds a little dry - do they have any grease in the carriages??

2.7kg also sounds tight - if this is a truck on two parallel rails, i would slacken the screws on one rail, fit the carriage/plate etc and the gently tighten the screws as you slide the carriage assembly along. Also the same for the screws holding the carriages to the plate - slacken and tighten them with the assembly in position. This allows all alignment stresses to be released hopefully.

Still sounds like it needs grease though, my HiWin stuff was very quiet.

[ba99297]

That sounds a little dry - do they have any grease in the carriages??

2.7kg also sounds tight - if this is a truck on two parallel rails, i would slacken the screws on one rail, fit the carriage/plate etc and the gently tighten the screws as you slide the carriage assembly along. Also the same for the screws holding the carriages to the plate - slacken and tighten them with the assembly in position. This allows all alignment stresses to be released hopefully.

Still sounds like it needs grease though, my HiWin stuff was very quiet.

Yes you are correct, I haven’t put any grease yet
Is there any special type of grease for these carriages, or a general purpose grease can do the job?

[Lee Roberts]

Yes you are correct, I haven’t put any grease yet
Is there any special type of grease for these carriages, or a general purpose grease can do the job?

A general purpose Lithium 2 grease will do just fine:

A Premium quality mineral oil, lithium thickened lubricating grease suitable for general purpose applications in plain and anti-friction bearings.

Conforms to leading bearing manufacturers specifications for general purpose industrial and automotive grease.

.Me

[ba99297]

Hello everybody and happy new year
I reastart my project that has been stoped for more than 6 months
I finally epoxy level X axis and i will do the same with the y axis (the gantry) as the milling of the gantry wasnt as good as i expected
I will apply two layers of epoxy 4mm each.

Many off you may wonder why i go with two layers of 4mm instead of one layer 5mm.
To be honest this is the second try of epoxy level the gantry
The first try went wrong
It wasn’t the resign as i had no problem with the x axis leveling
The reason off the first fail was this


After having the gantry milled there was a 3mm 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. i don’t know if i am understood.
So at the second try i choose to cast two layers. The first one will cover the groove and cover the 3mm gap and the second one will be layed on a flat surface.
Today morning i start with the first layer
First i put the gantry lay on the x axis blocks as x axis is perfectly leveled after the epoxy method



I zero my dial gauge in order to level the gantry parallel to X axis.
The 1.9 degrees tilt that the gauge show is a permanent error after an accident




In order to achieve perfect level tuning i use some screws as jacks


I knew that i couldnt have zero level at every point of the gantry as the gantry is not true flat. I was trying for an average zero level.


All the previous night i use an electric heater to rise the temperature to 20-21 celcious

Today morning i start creating the dome

I use both mdf and foam



Here is the epoxy i use


More than 10 hours working time
300 mpas viscosity
Pot life 29 hours (70 ml at 23c)
and here is the data sheet
http://www.resoltech.com/IMG/pdf/DS_...21.07.2016.pdf


Price 36 euros




Thanks for your time
Will be glad to read your comments

Vagelis

[ba99297]

48 hours at 20 co after casting the first epoxy layer (4mm thick) is sticky and starts hardening.
Today morning 8-1-2017 I apply the second layer (also 4mm thick)
Things seem to be ok.
The epoxy is transparent and clear as glass
After full curing I will upload photos.
Mean while (until the epoxy hardens) I will start working on Z axis

Vagelis

[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).