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drilling straight holes
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10-27-2015, 09:16 AM
We have a project at work where we need to drill 500 perfectly straight 1" diameter holes, through 5 1/2" thick Glu-lams. the drill presses we have only have a 4-5" throw. These holes must line up on each end as there will be a steel bracket on either side bolted to the member. If anyone has suggestions on the easiest way to accomplish this it would be appreciated.
10-27-2015, 09:29 AM
Start them all with the drill press and drill to max depth then finish them with a 1" ships auger. Its edges will guide it straight by following the previous hole
WoodNET... the new safespace
10-27-2015, 09:39 AM
I'll go out on a limb and say you don't have the right tooling.
Mark
I'm no expert, unlike everybody else here - Busdrver Nah...I like you, young feller...You remind me of my son... Timberwolf 03/27/12 Here's a fact: Benghazi is a Pub Legend... CharlieD 04/19/15
10-27-2015, 09:41 AM
Splinter Puller said: There's no guarantee the hole is going to be straight to begin with... How much over sized are the holes on the plate?
Mark
I'm no expert, unlike everybody else here - Busdrver Nah...I like you, young feller...You remind me of my son... Timberwolf 03/27/12 Here's a fact: Benghazi is a Pub Legend... CharlieD 04/19/15
10-27-2015, 09:43 AM
CLETUS said: There's no guarantee the hole is going to be straight to begin with... How much over sized are the holes on the plate? [/blockquote] I've set up my drill press to drill straight and perpendicular holes. Doesn't yours do this also?
WoodNET... the new safespace
10-27-2015, 09:50 AM
The plates have not been fabricated yet, but they should be about 1/16" over sized. We have had success in the past doing this by hand, but those were with 1/2" holes, and 4 1/2" thick members. These are for trusses, and we will be cutting them and dry fitting everything together, then sending to the job site in pieces, as they will be to big to transport assembled.
10-27-2015, 09:52 AM
Splinter Puller said: There's no guarantee the hole is going to be straight to begin with... How much over sized are the holes on the plate? [/blockquote] I've set up my drill press to drill straight and perpendicular holes. Doesn't yours do this also? [/blockquote] I'm not saying it can't be done, but 5" is pretty deep and you've gotta do 100 holes. There is a lot of opportunity for wander. There are better options than a drill press.
Mark
I'm no expert, unlike everybody else here - Busdrver Nah...I like you, young feller...You remind me of my son... Timberwolf 03/27/12 Here's a fact: Benghazi is a Pub Legend... CharlieD 04/19/15
10-27-2015, 10:01 AM
CapecodWW said: Well, that will give you an 1/8" of overall play. I guess I'd try SP's plan. Keep the bits sharp and don't over load them.
Mark
I'm no expert, unlike everybody else here - Busdrver Nah...I like you, young feller...You remind me of my son... Timberwolf 03/27/12 Here's a fact: Benghazi is a Pub Legend... CharlieD 04/19/15 
10-27-2015, 10:33 AM
this
 plus this  and a fabricated drill guide out of steel with a plate and a tube to guide the drill bit at least 5" long. clamp the plate to the work insert the drill into the tube drill the hole.
Let us not seek the Republican Answer , or the Democratic answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future John F. Kennedy
10-27-2015, 11:49 AM
Indeed you need a bigger drill press.
Would not try this with a short plunged press. You'll booger the hole on re-registration. This is not a job for girliemen. Would use new hss brad points with 1/2" shanks, maybe 4 or 5 of them! And I would relax the tolerances on the fit. Perhaps over shoot the diameter. It will be darn hard to get the drill to exit on the money. Bushed templets are essential unless you have impeccable fencing and stops. This is near guess & x-golly drilling. Moreover, if the stock is badly milled, out of square etc: All bets are off. Possible Drilling tools
Pat Warner
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