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<blockquote data-quote="pollyp" data-source="post: 563767" data-attributes="member: 4527"><p>rather than cut new wood n waste material, I'll reuse the prev thick square panels.</p><p>countersunk the screws to plug up the holes n make the surface flat</p><p></p><p>[ATTACH=full]28061[/ATTACH]</p><p></p><p>found I had a bunch of 11mm glass marbles, use them as bearings.</p><p>cut a 10x10cm bearing retainer out of 10mm thick board</p><p></p><p>[ATTACH=full]38335[/ATTACH] </p><p></p><p>drill a 10mm hole first and then use a 13mm countersunk bit to enlarge the holes but just before reaching the end of the 10mm hole. this creates a retaining lip so the 11mm marble can't fall through</p><p></p><p>[ATTACH=full]38334[/ATTACH] </p><p></p><p>marble sits nice n centre</p><p></p><p>[ATTACH=full]28060[/ATTACH]</p><p></p><p>finished bearing</p><p></p><p>[ATTACH=full]38339[/ATTACH] </p><p></p><p>place in middle of plate. the wooden retainer just rests on the surface and stops the balls rolling off</p><p></p><p>[ATTACH=full]38336[/ATTACH] </p><p></p><p>placed under one wheel. wedged against the wall to prevent the front rolling off when i jack up the other side</p><p></p><p>[ATTACH=full]38338[/ATTACH] </p><p></p><p>first issue is the 4 balls are concentrating the 300kg corner weight (75kg each ball) onto the soft wood surface and denting it so it jams. need a harder surface</p><p></p><p>[ATTACH=full]38337[/ATTACH] </p><p></p><p>so shuved smooth floor tiles against the marbles and yay it works. smooth turning, no stuttering. very slight springiness at high steering angles due to the wheel camber tilting from the castor and compressing one side of the tire.</p><p></p><p>[ATTACH=full]38333[/ATTACH] </p><p>[ATTACH=full]29883[/ATTACH]</p><p></p><p>so tdays test result is:</p><ul> <li data-xf-list-type="ul">need more balls across the surface to spread the load (got loads of em)</li> <li data-xf-list-type="ul">balls have to roll on a smooth hard surface preferably sheet metal cos ceramic can chip off</li> <li data-xf-list-type="ul">figured I don't need to limit the size of the bearing retainer plate (previously thought the balls would drop out if it rolled beyond the edge) cos the retaining countersunk lip of the hole would retain the balls that roll outside the plate so I can actually make it the same size as the plate</li> </ul><p>next design to follow</p></blockquote><p></p>
[QUOTE="pollyp, post: 563767, member: 4527"] rather than cut new wood n waste material, I'll reuse the prev thick square panels. countersunk the screws to plug up the holes n make the surface flat [ATTACH=full]28061[/ATTACH] found I had a bunch of 11mm glass marbles, use them as bearings. cut a 10x10cm bearing retainer out of 10mm thick board [ATTACH=full]38335[/ATTACH] drill a 10mm hole first and then use a 13mm countersunk bit to enlarge the holes but just before reaching the end of the 10mm hole. this creates a retaining lip so the 11mm marble can't fall through [ATTACH=full]38334[/ATTACH] marble sits nice n centre [ATTACH=full]28060[/ATTACH] finished bearing [ATTACH=full]38339[/ATTACH] place in middle of plate. the wooden retainer just rests on the surface and stops the balls rolling off [ATTACH=full]38336[/ATTACH] placed under one wheel. wedged against the wall to prevent the front rolling off when i jack up the other side [ATTACH=full]38338[/ATTACH] first issue is the 4 balls are concentrating the 300kg corner weight (75kg each ball) onto the soft wood surface and denting it so it jams. need a harder surface [ATTACH=full]38337[/ATTACH] so shuved smooth floor tiles against the marbles and yay it works. smooth turning, no stuttering. very slight springiness at high steering angles due to the wheel camber tilting from the castor and compressing one side of the tire. [ATTACH=full]38333[/ATTACH] [ATTACH=full]29883[/ATTACH] so tdays test result is: [LIST] [*]need more balls across the surface to spread the load (got loads of em) [*]balls have to roll on a smooth hard surface preferably sheet metal cos ceramic can chip off [*]figured I don't need to limit the size of the bearing retainer plate (previously thought the balls would drop out if it rolled beyond the edge) cos the retaining countersunk lip of the hole would retain the balls that roll outside the plate so I can actually make it the same size as the plate [/LIST] next design to follow [/QUOTE]
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