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Discussion in 'Other Builds' started by Mac6986, Oct 10, 2017.
Build progress of custom roller table for applying graphics
Mac6986 published a new build:
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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.
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.
Do you move it by hand or will you be powering it with motors to unroll and hold tension?
the gantry will be hand-pushed.
I have been thinking about something like this for some time now. Am interested to see how this works out for you.
Just a thought. 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.
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.
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.
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?
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.
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.
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.
Note, 20x80 framing shown but using C-Beam sections for the verticals may provide stiffer joints at the upper connections.
Hi, Have you completed the project.... Niyazi
Hi wonder how this is going?
I was looking at these at a recent trade show here in the UK, just wondering where i could get a roller?
I've been working on a roller table design of my own and came across this post. I'm having trouble finding the actual roller. Did you have to build the roller or did you use an existing? Would love to see how this project is coming along?
Hey guys, Long time no talk!
short answer, yes. I finished it.
The longer story was that it sat wit the frame and the MDF board inside, and for about 8 months, I had a very expensive table topper. My workload, plus getting married, and then buying a house, just took all of my free time and I wasn't in a desperate need of it, it was just going to make my life easier.
I slowly acquired the parts, and I took your advice @Rick 2.0 for the sliding carriage for the gantry. Had some custom brackets 3d printed, got the wiring harness with a momentary switch off amazon to control the actuators and slapped it all together.
Ill get you guys some pictures and a final build tally, but it works great.
I'm really keen to see your finished pics... we really need one of these in our sign shop
Would love to see this in action!
Any chance, you'd update with pics and/or video?