Rebuilt the bottom Half
Posted by johneato
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Rebuilt the bottom Half January 27, 2014 12:14PM |
]I have been reading all the ideas and solutions on various threads and have brought together into my interpretation and rebuilt the bottom half. Gone is the mdf, ply, acrylic and ribbon cable.
The table and side plates have been replaced with 10mm polycarbonate. I reduced the weight of the table as much as possible by removing large areas, but still very very sturdy. Added belt fasteners and tensioner.
Printed a cable chain courtesy of thingiverse and replaced the ribbon with 6 55/0.1 wires. Halved the volt drop in the cabling.
Plus a few other tweaks picked up on the forum.
Many thanks to all who have contributed, it prints beautifully.
John
The table and side plates have been replaced with 10mm polycarbonate. I reduced the weight of the table as much as possible by removing large areas, but still very very sturdy. Added belt fasteners and tensioner.
Printed a cable chain courtesy of thingiverse and replaced the ribbon with 6 55/0.1 wires. Halved the volt drop in the cabling.
Plus a few other tweaks picked up on the forum.
Many thanks to all who have contributed, it prints beautifully.
John
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Re: Rebuilt the bottom Half January 27, 2014 02:52PM |
Erik
The weight is about 320 grms against the original that came in at about 110grms. So its about 3 times the weight, but when you factor in the weight of the aluminum and glass the total weight increase as a percent is far less. I had concerns about the extra weight and the increase in inertia. Also I was concerned how much the cable chain would add. Printing at default speeds it's fine, not tried going faster, but I'm sure if I increase speeds then the extra mass will tell. Anyway I'm retired, I don't need extra speed.
Maybe an highspeed table next.
However I have to say it is nice to find the setup of the table the same as when I last used it.
One thing I have noticed since having a stable platform is that the Z axis overtime tends to lean forward, the screws are as tight as I can make them but there is still movement. Trying to think how to brace it.
John
The weight is about 320 grms against the original that came in at about 110grms. So its about 3 times the weight, but when you factor in the weight of the aluminum and glass the total weight increase as a percent is far less. I had concerns about the extra weight and the increase in inertia. Also I was concerned how much the cable chain would add. Printing at default speeds it's fine, not tried going faster, but I'm sure if I increase speeds then the extra mass will tell. Anyway I'm retired, I don't need extra speed.
Maybe an highspeed table next. However I have to say it is nice to find the setup of the table the same as when I last used it.
One thing I have noticed since having a stable platform is that the Z axis overtime tends to lean forward, the screws are as tight as I can make them but there is still movement. Trying to think how to brace it.
John
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Re: Rebuilt the bottom Half January 28, 2014 08:13AM |
looks like the same kit (Maplin's is Rolson too, with the same assortment), Maplin is cheaper if you have one nearby 
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Re: Rebuilt the bottom Half January 28, 2014 11:15AM |
The problem with springs is that there are so many variables, you can exclude the length by using disc springs (don't know if that is the right engrish word), just ad as many as needed
..and don't think you can buy a long spring and just cut it into shorter parts, that will not work without special spacers, the spring have to be made to length from anew
Mine was made of Ø1.2 spring wire, outer D=8mm, length (relaxed) 8mm
..and yes there should be a washer between the spring and the bed, this is only temporary until I get the time to redesign the bed, I'm not retired yet, just tired ;-)
Erik
..and don't think you can buy a long spring and just cut it into shorter parts, that will not work without special spacers, the spring have to be made to length from anew
Mine was made of Ø1.2 spring wire, outer D=8mm, length (relaxed) 8mm
..and yes there should be a washer between the spring and the bed, this is only temporary until I get the time to redesign the bed, I'm not retired yet, just tired ;-)
Erik
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Re: Rebuilt the bottom Half January 28, 2014 03:25PM |
Paul
Duet was removed and two additional screw connectors fitted in the marked positions. Top is the thermistor and bottom is the heated bed. I also reprinted the Duet enclosure with a suitable hole for the addtional wires.
Notched the Heater PCB so I could fit 2 additional 3 way screw connectors, the notch enabled the connector pins to reach the tracks on the PCB
Ran 6 55/0.1 wires through the cable chain. At the back of the Duet I spliced the 6 wires into two larger diameter wires, this fitted better into the Duet connectors, better than trying to get three wires into each connector.
John
Duet was removed and two additional screw connectors fitted in the marked positions. Top is the thermistor and bottom is the heated bed. I also reprinted the Duet enclosure with a suitable hole for the addtional wires.
Notched the Heater PCB so I could fit 2 additional 3 way screw connectors, the notch enabled the connector pins to reach the tracks on the PCB
Ran 6 55/0.1 wires through the cable chain. At the back of the Duet I spliced the 6 wires into two larger diameter wires, this fitted better into the Duet connectors, better than trying to get three wires into each connector.
John
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