huangyhg

standard radius sizes
i am wondering if anyone has a resource for standard radius callouts.
that is, i would like to specify a radius diameter for inside cuts of a plate for example (lightening holes) to enable the cutter to use the same drill bit for cost effectiveness.
does anyone know where can access this information?
check out our whitepaper library.
tool supply catalog.
a standard radius would be the radius of any endmill cutter....1/8, 1/4, 3/8.....etc. i would just make the radius a two place dimension to give the machinist some flexibility. also, check the machinery's handbook for standard drill bit sizes or do a search on the web.
best regards,
heckler
sr. mechanical engineer
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machinery handbook. radii can be anything. if you mean fillets, look at the tool radius.
chris
systems analyst, i.s.
solidworks/pdmworks 05
autocad 06
if you want to give your machinists flexibility, modify the radius callouts with either min or max.
art without engineering is dreaming; engineering without art is calculating.
steven k. roberts, technomad
i agree. i always use min or max, unless the design needs otherwise.
chris
systems analyst, i.s.
solidworks/pdmworks 05
autocad 06
general rule of thumb the bigger the better. if you are machining a plate say three inches thick no one will thank you much for putting a 1/8 rad in the corner. have you ever tried buying a 录 cutter 3 inches long?
also if you are looking to cnc machine these a radius bigger than the cutter is best as you then have a cutter path and it does not 鈥渟lam鈥?into the corners.
ok, well the plate is 1/4" thick...
its somewhat square, and the cut is somewhat square as well... a fillet on the order of .100 on the inside of the lightening cut, give or take, looks ok from a design standpoint.
so should i specify .12 min as the dimension? (1/8 drill)
again, im after low cost, ease of manufacturabilty here.
r.12 would be a 1/4 drill, and sounds reasonable given your matl thickness.
oh yeah woops... ok
if you are after the lowest cost, consider makeing them round holes, an endmill diameter 卤.020 and a big surface roughness callout (maybe 125 rms) so the machinist can just "plunge" the endmill--in and out.

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