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Vinyl Application Roller table

Discussion in 'Other Builds' started by Mac6986, Oct 10, 2017.

  1. Mac6986

    Mac6986 Well-Known
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  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Nice design. May have a bit of a rigidity issue in the frame over the top. To help resolve that I would suggest laminating another piece of 20x80 to both ends of the gantry, extending from the top of the upper C-Beam to the bottom of the side gantry plate. Clip it to the gantry plate with right angle clips and provide additional connection plates at the top to the end of the C-Beam. You might also take a look at how the side gantry plates work on the CRH C-BEAM Router, steel capable. This would greatly simplify your build and do it at a slightly lower cost.
     
  3. Mac6986

    Mac6986 Well-Known
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    Thanks for the input, the gantry is still a work in progress. not sure if i will be using actuators or linear thrust controllers for raising and lowering the roller. rigidity was definitely a concern with the gantry. the force pushing down on the roller will be roughly 25-30 lbs, no more.
     
  4. mcbuilder22

    mcbuilder22 Journeyman
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    Do you move it by hand or will you be powering it with motors to unroll and hold tension?
     
  5. Mac6986

    Mac6986 Well-Known
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    the gantry will be hand-pushed.
     
  6. Anthony Bolgar

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    I have been thinking about something like this for some time now. Am interested to see how this works out for you.
     
  7. GrayUK

    GrayUK Master
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    Just a thought. :rolleyes: 25-30lbs pressure down will be reflected in 25-30lbs pressure up, as far as the lower wheels are concerned, and I don't know how you plan to generate that pressure. :confused:
    However, what about if the pressure was generated from underneath the table, i.e. pulling down by pushing up against the table/base? The gantry legs would extend down the side of the table, accommodate this, to some kind of torque ratchet/motor or something? The gantry would be in a whole different stress situation. I don't know, just chucking it out there. :D
     
  8. Mac6986

    Mac6986 Well-Known
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    The plan is to have a light duty actuator attached to the spindle on both ends of the roller, connected to dual pole, momentary switch so I can control height and force of the roller.

    I am no structural engineer, but my thought was that the force created is distributed across all the contact points. So since the roller pushing down, essentially would "lift" the weight of the gantry + pushing force, and the wheels under the table would bear all that force. 30 lb of force / 8 wheels = 3.75 lbs of force on each wheel. Is that the right way to think?

    I am trying to keep the system as simple as possible, I was trying to avoid moving the table surface up and down, too many moving parts.

    My other idea is to drop the whole wheel idea and use a pair of HG15 Blocks on each side with some linear rail.
     
  9. GrayUK

    GrayUK Master
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    Okay, so, what about having the equivalent to the gantry, but under table with say, a 25lb weight hanging from it. Use the actuators to lift the roller, and therefore adjust the weight being applied to the surface? This way you can determine the maximum pressure available, maybe even adjust it to suit, by adding or subtracting the weights? Maybe forget about actuators and invest in some stepper motors and simply drive the weight, as applied by yourself, up and down the table?
     
  10. Jonathon Duerig

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    What about having weights attached to the ends of the roller? One or a couple of disc-shaped weights from a gym. They already have holes through them and can be added to the end of any large shaft. Then the gantry just needs to provide some kind of reasonable lightweight bushing and acts as a guide for the roller.
     
  11. Mac6986

    Mac6986 Well-Known
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    This is designed with no table legs, because it will be placed over top of an existing table. The exiting table underside is used for storage, so I'm trying this solution to try and keep from re-arranging my shop to accommodate all the storage under the table.
     
  12. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    With proper gantry plates you shouldn't have any issues pushing down on the roll with 25-30 pounds of force. Simple concept shown below using XL Gantry Plates.

    Outside.jpg Inside.jpg
    Note, 20x80 framing shown but using C-Beam sections for the verticals may provide stiffer joints at the upper connections.
     
    Mac6986 likes this.

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