View Full Version : Cute gizmos but worthwhile

06-12-2010, 07:13 PM
Was in HD today and saw this (a set of 6 or 7 different sizes) on sale:

Sort of a combo drill/tap/maybe countersink.
Web page says drill is hss. No mention of the tap part. Conceivable that the hss drill has a carbon steel tap grafted to it?

Anyone used these? Seems to me that the material thickness for the tap would be fairly thin...1/4 inch or less. Or, leave'em to the electrical guys?

06-12-2010, 07:18 PM
Haven't tried them,but I'm going to HD after while.

06-12-2010, 07:20 PM
I have used the greenlee ones when I was drilling and tapping back plates for control panels. it sure made life easier.

06-12-2010, 08:07 PM
They are for thin sheet - from the web page:

Material thickness - 10 gauge Material type - mild steel, copper, brass, aluminum Shank - 1/4" quick change hex Drill Material - hardened high speed steel Drill point - split point with web thinning

"Self-tapper" screws have been around for quite a while. Most were "one offs" and were hardened steel - not HSS.

These should do OK but they can be re-sharpened on the drill point but re-sharpening the "gun" tap behind it may be another matter.

They are essentially a "throw-away" item.

06-12-2010, 08:27 PM
McMaster Carr sells those, but without the countersink. They seem useful mainly for CNC jobs.

06-12-2010, 08:30 PM
Anything Greenlee is going to be specific to electrical duties... and also likely to be of pretty good quality.

MSC/Enco were selling drill/tap combos a few years back. I got one in 1/4-20 and it was very handy within its limits. The drill and tap sections were a little longer and there was no counter sink at the end. I used them in a hand drill since the two sections needed very different rpms that just wouldn't make sense in a drill press.

I haven't looked in a while, they probably still sell them.

dr pepper
06-13-2010, 01:38 AM
I got these from RS components, I've used them on genaral repairs they seem ok for occaisonal use.
These are made by volkel cat No. 67020 and go from M3 to M12.


06-13-2010, 03:32 AM
here they are... Enco calls them DRAPS...

drill-tap combos (http://www.use-enco.com/CGI/INSRIT?PARTPG=INSRAR2&PMAKA=510-1320&PMPXNO=8910593)

and before anyone else beats me to it, here's a completely unrelated wikipadia reference...


or perhaps this more to your fancy...


And this one is even less relevant...


Oh, I never realized what fun this could be!

06-13-2010, 09:42 AM
Yes, they rock. But, as previously mentioned, I build a lot of systems in NEMA boxes. These are the bomb for drilling and tapping back panels, as long as they are steel panels, I use nutcerts in aluminum panels.

06-13-2010, 10:37 AM
Anything Greenlee is going to be specific to electrical duties... and also likely to be of pretty good quality.

Yep - they are most likely made to be drill/tapping 10ga steel.

06-13-2010, 11:29 AM
[QUOTE=Dunc]Was in HD today and saw this (a set of 6 or 7 different sizes) on sale:

.................................................. .................................................. .............................


Do you recall the approximate price?

I've purchased individual drill/taps with a standard round shank, they weren't exactly cheap. It seems like this set is an item that would be out of the price range of HD shoppers.

06-13-2010, 02:10 PM
Speaking of drilling into sheet metal, it was only about 6 or 7 years ago that I caught on to what those cone shaped, multi-step drill bits were good for;
drilling holes in sheet metal, of course. Now I have them in sizes up to 3/4 inch diameter at the largest step. Nowdays they're inexpensive too, so if anyone else was slow on the draw like I was, go buy a set.

06-13-2010, 03:14 PM
I have used them before and they do work great. Expensive though if you buy the good ones. They are ground from solid HSS. No carbon steel here (Thank god, carbon steel taps should be banned)

06-13-2010, 08:13 PM
Pricing is $25 (Cdn) marked down from $30 & change. Kit consisted of 5 or 6. They were in an area of clearance items: slow movers? Given their limited thickness & metric only decided to pass.

@DR- don't know where you are but these were in the Orleans store (east-end Ottawa, ON)