90 Degree Angle Drill

stumpeater · #1 (**permalink**) 01-24-2010, 03:27 PM

Recently Sambo was chasing a 90 degree drill, I was also in need of one on the weekend, and came up with this idea. It's an old 1/4" drill chuck that I re-threaded to suit my angle grinder, 10mm X 1.5mm. It works well. Good for tight spots.

boxhead · #2 (**permalink**) 01-24-2010, 03:33 PM

Good idea.

Bernica · #3 (**permalink**) 01-24-2010, 08:32 PM

Now you have a 10,000 rpm drill. Better wear eye protection, and maybe a flak jacket too!!

bobcowan · #4 (**permalink**) 01-24-2010, 08:43 PM

I bought an adapter from Sears for $20. Simply remove the original chuck from your VSR drill motor, and put this in it's place.

http://www.sears.com/shc/s/p_10153_1...0+degree+drill

Zedn · #5 (**permalink**) 01-24-2010, 11:36 PM

Most hardware stores sell flexible hose attachements also that allow you to get in tight spots.

I reckon you would go through a lot of drill bits going at the speed of a grinder, especially in thick steel.

Good idea though.

Liam

Modena · #6 (**permalink**) 01-25-2010, 12:14 AM

I second that - good idea, too bloody dangerous though!

cameron02 · #7 (**permalink**) 01-25-2010, 03:38 AM

Dangerous??? But it would be so handy for drilling pet

rol tanks.

EarlsflyinCobra · #8 (**permalink**) 01-25-2010, 04:51 AM

Here is a real sweet set up that comes in real handy..................Item # MC 0101 from Matco tools..............

https://www.matcotools.com/Catalog/t...&page=1&#34062

RodgerH · #9 (**permalink**) 01-25-2010, 05:23 AM

These are nice, especially if you're in a really tight spot.

http://cgi.ebay.com/Dotco-Aviation-A...item335879bf57

http://cgi.ebay.com/2lb-90-Degree-Dr...item58859e016f

Rodger

stumpeater · #10 (**permalink**) 01-27-2010, 12:40 AM

I didn't recommend this for everyday use, just for the odd occasion. Yes the drill bit would get hot in thick steel, but the steel/ aluminium on the cobra is no problem. As for the danger, it is no more dangerous than a grinding disc. The outer edge of a 100mm disc is travelling at 52m/sec @ 10,000 rpm whereas the 6mm drill bit is only doing 3m/sec, if the disc came apart, which can happen, much more shrapnel to dodge and travelling faster too! I've got one of those angle attachments, and find it hard to control in tight spots as you have to hold the drill and the attachment at the same time. Anyway it works for me. Peter.

Woodz428 · #11 (**permalink**) 01-27-2010, 05:00 AM

I have a nice compact air drill that is 90 degree. Variable speed and because it's air it never gets hot. Had it 30 years and use it regularly and never had a problem. The head can be rotated so it can get in many tight spots. Feels like one of the bearings is getting somewhat loose so I'll have to look into that, but after 30 years pretty minimal wear.

Jerry Clayton · #12 (**permalink**) 01-27-2010, 07:46 AM

that angle grinder doesn't run at 10,000 rpm so the danger isnt as bad as most of you think

RodgerH · #13 (**permalink**) 01-27-2010, 08:59 AM

Quote:

Originally Posted by Jerry Clayton

that angle grinder doesn't run at 10,000 rpm so the danger isnt as bad as most of you think

Are you sure about that?
http://www.dewalt.com/us/products/to...roductID=10649

Woodz428 · #14 (**permalink**) 01-27-2010, 11:06 AM

Quote:

Originally Posted by RodgerH

Are you sure about that?
http://www.dewalt.com/us/products/to...roductID=10649

I'm not going to argue the point although in the specs it says "11,000 rpm motor" and then gives the spec as of "11,000 rpm unloaded speed". Now I have a Makita, not a Dewalt, but the Makita has a reduction head. If the Dewalt does, is it 11,000 rpm motor speed or mandrel speed? It's moot to me ,I have 90 degree air drills, but I think those specs seem to be contradictory...if the Makita construction is anywhere similar.

OZVENOM · #15 (**permalink**) 01-27-2010, 02:03 PM

Necessity is the mother of invention.
I think its a great idea thinking out side the box and yes perfect for drilling sheet .
Once again something positive has people turning a negative.

over the years i have made many custom tools and cutters for difficult jobs . It is amazing how many times these have saved the day.

oz.

boxhead · #16 (**permalink**) 01-27-2010, 03:27 PM

A truer word has rarely been spoken OZ.
Making something that will do the job on the spot is just another part of the enjoyment.

Woodz428 · #17 (**permalink**) 01-27-2010, 04:34 PM

Quote:

Originally Posted by OZVENOM

Necessity is the mother of invention.
I think its a great idea thinking out side the box and yes perfect for drilling sheet .
Once again something positive has people turning a negative.

over the years i have made many custom tools and cutters for difficult jobs . It is amazing how many times these have saved the day.

oz.

I've got a whole drawer in my tool box full of them. Some only used once, but cheaper and quicker than finding a tool and buying it for a single job.

RodgerH · #18 (**permalink**) 01-28-2010, 06:54 AM

Good morning to all,

My messages weren't intended to be negative. I think Peter was pretty creative to make a 90 deg. drill from a 4-1/2" angle grinder. Like many of you, I've got many tools I've made or modified thru the years. That's part of being a gearhead on a budget.

My first message was to let you guys know about the miniature 90 deg. threaded-bit air drills. Unless you're in aviation maintenance, you may never have seen these.

My second message questioned another member's statement that 4-1/2" grinders don't run at 10,000 rpm. I have a Makita and a cheapy from Harbor Freight (which has been a surprisingly good tool). I looked this morning, and the Makita is labeled at 10,000 rpm no-load spindle speed, the Chicago Electric (Harbor Freight) at 11,000 rpm. My cutting and grinding discs, and flap wheels are labeled for 13,200 or 13,300 rpm.

No doubt others of you may have something different....and that's OK.

As Peter said, the speed, whatever it is, is not an issue for his use on thin aluminum or mild steel. Trying to drill thick steel or stainless steel would probably melt the bit, but he's not doing that. Again, hats off to his ingenuity.

Now, peace to all of you.

Rodger