is there any reason why to use .201 inch holes over .2 inch holes?
Nope.
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No. I personally use 13/64 and know that 8033 do too.
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We use .191, but anything in that range works
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Weight.
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.201 is the tap drill for a 1/4-20, which is a nice feature. A 0.200 hole would work fine for that as well, but it isn’t a standard drill bit size. If you’re boring or lasering a hole, that doesn’t really matter.
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Gotta join the 0.196 camp
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We’ve since moved to .196 and usually .201 in printed parts.
Honestly, the reason I like using .196 is because most COTS parts have that exact hole size so my replicate features can bridge across my own parts and parts from MkCAD.
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0.196, 0.201, 0.200 all the same as far as robotics is concerned., especially if you are using a hand drill to put in the hole. A piece of hair is 0.003 thick for comparisn.
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Sure, but Onshape requires the hole to be exactly the same size or the replicate will skip it / error out
Ahh, good point ,sorry not an onshape user.
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Worth noting that for anything in the .196 to .203 range we still use a 13/64 drill in our CNC. If the 2-7 thou matters in other methods (laser or printing) we’re typically doing test fits to adjust kerf compensation or extrusion settings and the CAD may not be adjusted since it’s machine specific. Typically it doesn’t matter.
You don’t have a 1/5" drill?
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Maybe idk I’m a software guy. 0.001 is meaningless to the fabrication of most FRC teams.
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Absolutely. if it is for interference/press fit application…
We’ve kinda simplified it for the students, if you’re using a 10-32 bolt then use # 10 drill bit. I think its 0.193
The correct drill size for a 1/4-20 tap is a #7 drill per the Machinists handbook. The diameter of the #7 drill is 0.201. That is where the 0.201 diameter comes from.
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Just did the math. To save 1 lb. from changing your holes from .2 in to .201 in, you’d need 130,000 holes on 0.25 inch thick aluminum. (:
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New plan this year: Spaghetti Strainer Bot
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0.196 is good, I’m just a 0.201 fan because it’s the 1/4-20 tap pilot hole size. One less drill I gotta keep around.
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