Electronics > Projects, Designs, and Technical Stuff
Home Brew Analog Computer System
notsob:
1. new drill bits - for an accurate centre
2. centre punch the location to be drilled after you accurately mark it out.
or
3. get a small jig made up, say about 1/4 the width of your panel, but with tabs at top and bottom so you can slide it - this could be made from wood. (with guide holes pre-drilled) that you can slide across your panel, use the first drilled holes to lock it into position as you move it across the panel.
4 find someone locally that has a CNC
Jebnor:
1) Centre punch the point
2) drill with a small hole (2mm) or with a center Drill that can be purchased at any machine tools shop.
3) drill with final size.
*USE a drill press*
GK:
--- Quote from: notsob on July 17, 2013, 01:53:57 am ---1. new drill bits - for an accurate centre
2. centre punch the location to be drilled after you accurately mark it out.
--- End quote ---
That's what I've been doing, but the "large" diameter bit still walks, no mater how accurate the initial center punch. I've even tried drilling accurate 1mm pilot holes with the dremmel, but still not good enough - the 7mm still walks to some degree. Standard twist drills are also a PITA for drilling in sheet as the larger holes never come out round.
What I can immagine I need is a 7mm drill bit with a really long, pointy tip, rather than the standard 45 degrees. Never seen something like that in the hardware store though. Or perhaps some kind of reaming bit?
Jig fabrication and/or and CNC means machine shop services; then it is easier and cheaper to just get the panels made by FPE.
GK:
--- Quote from: Jebnor on July 17, 2013, 02:14:04 am ---2) drill with a small hole (2mm) or with a center Drill that can be purchased at any machine tools shop.
--- End quote ---
You mean:
?
Used them many times in the tailstock on the lathe but never in a drill press. Instead of using one to drill a small diameter pilot hole (the larger twist drill will still walk to a degree), how about using a larger diameter one to drill the hole in its entirety?
robrenz:
These are great on sheet metal. The bit on the left has a 9/32" diameter which is very close to your 7mm. These also chamfer the hole very nicely. Use a lube on it while cutting.
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