Reddit reviews 36/37 Precision Drill Guide For 3/8-Inch or 1/2-Inch Power Drills, Portable & Lightweight, Folds Flat for Storage
We found 5 Reddit comments about 36/37 Precision Drill Guide For 3/8-Inch or 1/2-Inch Power Drills, Portable & Lightweight, Folds Flat for Storage. Here are the top ones, ranked by their Reddit score.
BUILT IN PROTRACTOR- drills accurate right-angled or variable-angled holes with the built-in protractor scaleADJUSTABLE- adjusts from 0 to 45 degrees in 5-degree increments in either direction of vertical drill positionPOSITIVE STOP- built-in depth stop for accurate drill depthWORKS WITH DOWELS- v-groove for positioning round stock, pipe or tubing. A slide lock facilitates sanding and buffingSTABLE- anchoring pins to hold the guide securely in place on flat surfaces, narrow edges or large tubing
Some acrylic blanks are just predisposed to doing that. I've had more than a few that would develop a crack along an invisible fault line during drilling and come apart, even with plenty of lubrication and a slow, sharp bit.
My number one question is: are you free-handing your drilling or are you using some kind of vertical drilling jig that holds everything steady and fairly square? Reason I ask is that it appears your blank did not blow out in a shattering sense, but rather is simple suffered a stress fracture. Blowouts are usually very jagged and "chippy," but this appears to be a fairly clean crack like what would happen if there were lateral (side to side) pressure from inside the hole...possibly from uneven pressure during drilling.
Anyway, to help when you drill acrylics, get a squirt bottle and mix 3-4 drops of liquid dish soap with a full bottle of water. Keep your borehole nice and wet and that will help reduce heat and lubricate the cutting process to produce better holes. Remember that when you do this, you'll need to let the blank dry for a few hours to remove any residual moisture.
FWIW, the jig I mentioned would be similar to this one which is available at your local big orange store. One summer long ago when my drill press was inoperable, I used one of those to drill some pen blanks. It required some patience, setup, and more patience, but it produced results roughly on par with the drill press.
This is the vise I used. It came with handle, but its nothing you couldn't whip up with some off the shelf parts if you wanted to.
The only thing I do not like about it, is that none of the material that came with it said what the thread pattern of holes used to jaw face on is. I had to play guess the bolt until I found one that fit.
Here is a gallery of some pics I took while doing it. I first cut down a few scraps to get the height right and did a test fit but didn't like the way that came out, so I decided to do the inset.
My inside cut was a touch off so I wound up with bit of a gap on the left side. Then I ripped down the 2x4 to a width that would fit on the face and secured it with wood screws both into the top and the 4x4s. I found a rough cut maple 2x4 that was a scrap from a furniture factory and cut that down for the outside jaw.
Then I bored all of the bench dog holes using a 3/4 forstner bit and a drill guide to keep them plumb. I had to make them wide so I didn't hit any of the vise parts. I bored four more holes in the face of the 2x4 that I can slip the bench dogs in to support long pieces.
I have been meaning to buy this, but have not had a project where I needed it.
General Tools & Instruments 36/37 Accu Precision Drill Guide https://www.amazon.com/dp/B00004T82L/ref=cm_sw_r_other_awd_G.W4wbXZ1J87Y
well I borrowed my father's drill jig. and then just stacked some scrap wood on either side of the desk to keep the width consistent. The jig handily has some screw holes on the bottom to attach it to things.
Something like this
http://www.amazon.com/dp/B00004T82L?psc=1
Or a homemade jig
Or spend the $55 for a drill press:
http://www.harborfreight.com/8-in-5-speed-bench-drill-press-60238.html
http://www.instructables.com/id/How-To-Drill-Straight-Holes-with-a-Hand-Drill-Usin/