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YYC: Slat for deck of CNC machine
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<blockquote data-quote="PeterT" data-source="post: 6212" data-attributes="member: 22"><p>Maybe this dwg will help you guys. I needed to refresh my brain on this stuff anyway with new software version. Agree 100% with RobinHood plus a few more things to noodle.</p><p></p><p>- re the M10 c/sunk mount holes, according to my selection drop down, regular M10 socket head cap screw c/sink depth = 0.394" (10mm nominal I guess). That's leaving very little (0.106") bottom meat for your 0.5" plate if you want the cap screw head fully recessed. And if the c/sink tool has a pilot head that could be an issue too. You might want to check machinery handbook, but this was my quickee conclusion.</p><p>- if above is M10 shoulder screw, c/sink reduces to 0.276" (7mm nominal). But you would have to source these specific fasteners & they may not be as common as you think.</p><p>- if you want to use regular cap screws but its ok to have the heads protrude, then we can doctor the prescribed c/sink depth, say 0.100" or 0.150" ..something nice <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>- easier yet from machining standpoint, no c/sink at all. So ask yourself why this is required. If you need it great, but if you can get by with just a hole & a washer, saves a lot of setup. The head & hole is all clearance so its not registering to anything in terms of the fastener.</p><p></p><p>- dwg example dimensions result if I define the upper left hand corner as datum & all hole dimensions originate from there</p><p>- I used inch dimensions on a metric part (just to prove I can). But if someone has metric/inch switchable DRO then you should go all inch or all metric</p><p>- your 150mm width works out to 5.906" as mentioned, so conceivably could be made from 6" nominal stock leaving 0.094" cleanup material. Personally, you have the plate on the mill for a lot of work, why not clean the edges & simultaneously make everything parallel & square including the edges unless the machine itself is a limitation. Your machinist may specify minimum rough stock in this case.</p><p>- btw your 940mm length works out to 37.008". I know you are rounding off to 37" for simplicity but just an FYI. When I labelled the hole dimensions I just defined x.xxx (thou) for consistency</p><p>- ignore my material, it must have been part of dwg template</p><p>- caveat: I'm a self-taught amateur to there may well be BS in what I'm saying above ^^</p><p></p><p>- HRS will be a cruddy finish so investigate what fly cut finish looks like. I know.. more machining & more $$ & slightly thinner piece.</p></blockquote><p></p>
[QUOTE="PeterT, post: 6212, member: 22"] Maybe this dwg will help you guys. I needed to refresh my brain on this stuff anyway with new software version. Agree 100% with RobinHood plus a few more things to noodle. - re the M10 c/sunk mount holes, according to my selection drop down, regular M10 socket head cap screw c/sink depth = 0.394" (10mm nominal I guess). That's leaving very little (0.106") bottom meat for your 0.5" plate if you want the cap screw head fully recessed. And if the c/sink tool has a pilot head that could be an issue too. You might want to check machinery handbook, but this was my quickee conclusion. - if above is M10 shoulder screw, c/sink reduces to 0.276" (7mm nominal). But you would have to source these specific fasteners & they may not be as common as you think. - if you want to use regular cap screws but its ok to have the heads protrude, then we can doctor the prescribed c/sink depth, say 0.100" or 0.150" ..something nice :) - easier yet from machining standpoint, no c/sink at all. So ask yourself why this is required. If you need it great, but if you can get by with just a hole & a washer, saves a lot of setup. The head & hole is all clearance so its not registering to anything in terms of the fastener. - dwg example dimensions result if I define the upper left hand corner as datum & all hole dimensions originate from there - I used inch dimensions on a metric part (just to prove I can). But if someone has metric/inch switchable DRO then you should go all inch or all metric - your 150mm width works out to 5.906" as mentioned, so conceivably could be made from 6" nominal stock leaving 0.094" cleanup material. Personally, you have the plate on the mill for a lot of work, why not clean the edges & simultaneously make everything parallel & square including the edges unless the machine itself is a limitation. Your machinist may specify minimum rough stock in this case. - btw your 940mm length works out to 37.008". I know you are rounding off to 37" for simplicity but just an FYI. When I labelled the hole dimensions I just defined x.xxx (thou) for consistency - ignore my material, it must have been part of dwg template - caveat: I'm a self-taught amateur to there may well be BS in what I'm saying above ^^ - HRS will be a cruddy finish so investigate what fly cut finish looks like. I know.. more machining & more $$ & slightly thinner piece. [/QUOTE]
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YYC: Slat for deck of CNC machine
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