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  1. #211
    Quote Originally Posted by Davek0974 View Post
    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?
    The creative adult, is the child who survived

  2. #212
    Quote Originally Posted by ba99297 View Post
    Yes you are correct, I havenít 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
    Last edited by Lee Roberts; 08-05-2016 at 01:38 PM.
    .Me

  3. #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

    Click image for larger version. 

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    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


    Click image for larger version. 

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    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


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    In order to achieve perfect level tuning i use some screws as jacks
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    Click image for larger version. 

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    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.
    Click image for larger version. 

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    All the previous night i use an electric heater to rise the temperature to 20-21 celcious
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    Today morning i start creating the dome
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    I use both mdf and foam
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    Here is the epoxy i use

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    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

    Click image for larger version. 

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    Price 36 euros
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    Thanks for your time
    Will be glad to read your comments

    Vagelis
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by ba99297; 06-01-2017 at 11:50 PM.
    The creative adult, is the child who survived

  4. #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

    Vagelis
    The creative adult, is the child who survived

  5. #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

  6. #216
    Quote Originally Posted by Clive S View Post
    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.
    Click image for larger version. 

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    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

  7. The Following User Says Thank You to ba99297 For This Useful Post:


  8. #217
    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
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    ..Clive

  9. #218
    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
    Click image for larger version. 

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    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
    The creative adult, is the child who survived

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