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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello, I have been having a hell of a time trying to drill with a hand drill accurately...I came across spotting drills that are meant for precise drilling. Can someone offer advice on this? The holes I need to drill are 3/32in, but I cannot find ANY spotting drills smaller than 1/8in. Also, angles are given. 90deg up to 120deg. I have come across alot of conflicting information out there. The drill bits I have are cobalt. Can I use a 1/8in spotting drill for a 3/32in drill bit? Thanks so much! Matt
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
Why use a hand drill? A power drill will be much easier to keep accurate - a cordless drill with trigger-controlled variable speed can avoid the need for centre-punching as you can start it slow & then speed up once it's got started.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
even with powered drills, center punching makes it easy. Just use a nail and hammer. My industrial tech teacher uses these things that are designed to break windows of cars when they go underwater. When you press, they spring load, then release.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
rp181 wrote ...
even with powered drills, center punching makes it easy. Just use a nail and hammer. My industrial tech teacher uses these things that are designed to break windows of cars when they go underwater. When you press, they spring load, then release.
Yea, just use one of those spring loaded punches, you can find one at harbor freight tools for like 3 bucks.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello all, I am using a hand drill. Ive tried center punching, but just cant seem to get it right. My last attempt left the holes about 1mm off, thus ruining the heatsink and the laser mount attempt. Someone I spoke to advised me to use a spotting drill, saying that it is the most accurate way to go. I ordered one on ebay, so we will see how it goes...From what I understand, the diameter of the spotting drill bit isnt that critical, as long as it is larger than the bit I plan to drill the hole with. I also picked up a rolling tap (as per the advice).
This is to mount my 40watt laser to a copper heatsink. (I am still having issues with cooling the laser). I was half way through going water cooling (ordered a cooling block and radiator) when the guys at Alt. Lasers reccomended a CPU heatsink and fan. They feel a copper heatsink and fan will be just right, and that water cooling is overkill.
Anyways, seeing as copper heatsinks cost 3times that of a normal Al. heatsink, I want to get it right the first time! My current method of drilling was to take the engineering drawings of the laser diode and apply them to the heatsinks measures for drilling. Before drilling, I layed the laser down and found perfect alignment. I used a small philips screw driver to dimple the heatsinks marks for the holes and then used cobalt drill bits to drill away. No good! Slightly off!!!!!ARG!!!! Matt
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
In the future, get a set of transfer punches (you can get a set from harbor freight for about $8) and use them to mark the locations of the holes. From there use a small diameter drill bit to drill out a reasonable sized depression where you want the hole, and then go at it with your full sized drill bit making sure to hold the drill perpendicular to the piece.
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Spotting drill
