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Last edited by Lee Roberts; 08-05-2016 at 01:38 PM..Me
2 Weeks Ago #213
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 wasnít 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 donít 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
Price 36 euros
Thanks for your time
Will be glad to read your comments
Last edited by ba99297; 2 Weeks Ago at 11:50 PM.The creative adult, is the child who survived
2 Weeks Ago #214
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
VagelisThe creative adult, is the child who survived
2 Weeks Ago #215
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?..Clive
2 Weeks Ago #216
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).The creative adult, is the child who survived
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