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Re: Desktop 1000 mm x 600 mm Gantry Router
First stage finished. nice and solid using standard C beam extrusion and 4 end plates.
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I decided to go with 1605 ball screws for accuracy as speed it less important for a small machine, next stage is to fit the 2 y axis stepper motors and test connect the electronics, limits etc
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Re: Desktop 1000 mm x 600 mm Gantry Router
Very kind of you to show all the pictures upside-down for the benefit of us Australian readers :highly_amused:
All you need to do now is take a hacksaw and a drill to those lovely end brackets and modify them to take the proxy sensors the right way on.
Kit
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Re: Desktop 1000 mm x 600 mm Gantry Router
The pictures were the right way up on my computer.....but glad to make our antipodean friends happy,
I have cut end plates with and without the lugs so I have options, I am going to test proximity sensors and mechanical switches and have a play with the electronics before going any further as I want to get the the speeds, limits, stops etc all working and sorted
My immediate problem is that the frame is 1 mm wider at one end, I am going to try and measure carriage to carriage to get an accurate dimension and shim the cross beams to try and remove as much inaccuracy as possible.
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Re: Desktop 1000 mm x 600 mm Gantry Router
I put some temporary plates on the Y carriages and used the cross beam to check the difference between each end, using some feeler gauges the gap is virtually identical at ~ 0.4 mm, the gap seems to be with the edges of the extrusion and the T slot plate so I am happy that the rails are square. I am going to put 1 mm pockets in the gantry side plates for the ball screw nuts, carriages and cross beams, so I can accommodate .2 mm either side for the X axis cross beams. Phew, first issue wasn't.
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Re: Desktop 1000 mm x 600 mm Gantry Router
Started to 'play' with electronics, all axis working, slaved C to Y axis, tested proximity sensors and they will work with the feeds I have setup without crashing. Relays setup.
Having a play with steps/ feeds etc Realistically the machine does not need to be super accurate so I am going to set it up to have a resolution of 0.01 mm with an expected tolerance of +/- 0.05 mm ?
Pleased with the results so far, I am using Stepperonline 2Nm Nema 23 Closed Loop Stepper Motor 5A 76mm & Servo Driver CL57Y, the movement is nice and smooth
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Waiting for some electrical components, once they arrive I will assemble the electronics properly
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Re: Desktop 1000 mm x 600 mm Gantry Router
Latest update, started cutting the plate for the , spindle, z axis. I have subcontracted the top and bottom of the z axis as I cannot get the squareness required and these are critical for the smooth running. My Stepcraft is good enough for plate Y/X but isn't square on the Z, anything over 10 mm thick and you can see a noticeable slant.
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Also start finalising the design for the dust shoe
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And doing test layouts for the electronics, I am mounting them upside down under the machine on rubber shock mounts
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Re: Desktop 1000 mm x 600 mm Gantry Router
Finished Z axis and done a dry assembly, using a standard Stepcraft dust shoe, next job is machining the gantry plates
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Re: Desktop 1000 mm x 600 mm Gantry Router
Very nice, keep up witht he good work :thumsup:
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Re: Desktop 1000 mm x 600 mm Gantry Router
Cut gantry sides, I had to use 10 mm cast plate as it is the maximum thickness I can cut with any reasonable accuracy. Very happy with fit, Ball screw support nuts and HGR15 carriages fitted in to 1.5 mm pockets in gantry plates and x axis cross beams 'sat' in their pockets with just a very small amount of play, about 0.8 mm. The gap can be closed with light finger pressure. I am going to thread the holes and tighten up x axis cross members and loosen off the ball screw support nuts and it there is still a gap I will make some shims.
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Re: Desktop 1000 mm x 600 mm Gantry Router
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Latest stage, 'dry' assembled all the mechanics and have wired up the main electronics, they are going to be installed upside down under the bed supported by 8 anti vibration mounts. I have moved all the axis and they are all very solid (its only a 1kw kress spindle so the forces will be low compared to most of the machines on this forum), the axis are very quiet and smooth running very pleased so far. Next stage is to 3d print drag chain mounts for x axis and route all the cables and fix main drag chain under the table to link Z/X to electronics.
(no idea why the pictures are upside down, cannot seem to sort it out)