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XY rig - Can a lead-screw linear actuator be mounted to a 20mm Gantry cart?

Discussion in 'General Talk' started by MarkR34, Nov 6, 2018.

  1. MarkR34

    MarkR34 New
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    I'd like to build an XY rig.

    There seem to be so many options but I haven't found exactly what I need.

    I'm thinking a belt-driven linear actuator (V-Slot® NEMA 17 Linear Actuator Bundle (Belt Driven)) with another rail/cart in parallel and then a lead-screw linear actuator mounted across would get the job done, but I can't see if/how the lead-screw actuator (on the v-slot) can be mounted to the 20mm Gantry cart (V-Slot Gantry Set - 20mm).

    I'm brand new to this so any help is appreciated!
     
  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Not even remotely following. Can you provide a concept sketch?
     
  3. MarkR34

    MarkR34 New
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    Thanks for taking the time to reply. Here's a sketch of the concept. Dimensions are about 500mm square
     

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    #3 MarkR34, Nov 6, 2018
    Last edited: Nov 6, 2018
  4. bubba

    bubba Well-Known
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  5. GrayUK

    GrayUK Openbuilds Team Elder
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    You will need a second actuator on the other Y-Axis, or your X-Axis will go out of square.
    Take a look at the Parts Store for lots of fittings to fit your needs.
    Plates and corner brackets would probably meet your requirements
     
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  6. MarkR34

    MarkR34 New
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    I haven't purchased yet. Thanks for the feedback! Vertical space is a constraint for me. The ACRO system appears to be taller than I need - I can't find any dimensions on the site.
     

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  7. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Actually there is a fairly simple way to keep it square. Move your belted axis to the middle of the platform, centering it under the screw drive and then just use the parallel secondary rail to maintain balance. As far as connecting the plates to the screw drive, that's also fairly simple. You merely place T-nuts in the bottom side of the screw drive and run screws up from the bottom side of the plate, through the plate holes and into the t-nuts. Not a perfect system as the heads of the screw used for the wheel axles will interfere with the bottom side of the screw drive rail so you may need some spacer washers. The oversize hole in the eccentric side of the plate may also be a problem getting and holding things tight.

    A CoreXY type design might be a better option. It eliminates the problem with the motors hitting the rounded corners.
     
  8. MarkR34

    MarkR34 New
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    Thanks Rick. I looked into CoreXY and it's really clever! Maybe, perhaps too clever for my first build attempt.

    I drew out your recommended solution. Your solution of placing it in the middle is a great idea. I didn't draw it out with the larger plotting area, but it would certainly achieve that.

    In terms of belt vs lead screw is there any pro/cons I should consider? When I redrew it I put the lead screw on the bottom. I have no hands-on basis for designing it either way since I haven't used either.
     

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