[ARC5] Hole for octal socket ... Try Unibits

[Kenneth G. Gordon]

On 3 Feb 2015 at 11:52, Tom Bridgers wrote:

> Have used Harbor Freight's Step Drill Bits with much success in making 1-1/4"
> inch holes in an aluminum chassis for octal sockets.  Their 1/4" to 1-3/8"
> Unibit will easily get the job done using either a dill press or hand drill.  A
> 2-bit package costs about $19 on sale at HF. 73, Tom. KE4RHH

I concur. Unibits have saved me many hours. They are also called 
"step-drills" as Tom mentioned. I agree withTom and highly recommend 
them. They are very easy to use if you don't have a drill-press, as they are 
pretty much "self-centering", and they do not have to be turned fast. In fact, 
slow is easier to control and works better.

Also, Greenlee punches are excellent, although, in my opinion, a bit more 
difficult to use, especially in a confined space. I have several of the correct 
sizes for sockets, both octal and miniature, but seldom use them since I 
bought the various sizes of Unibits.

The main advantage to Greenlee punches is that there are "D" shaped, 
square, and other shapes available. Since electricians use several different 
sizes and shapes, they are still available new.

Personally, I would never try to use a Nibbler on cast aluminum... In addition 
to the problem I have with my RA, there is too much chance of leaving a 
rough edge in cast. I do use a Nibbler on thin stock, though.

Rat-tail, and 1/2 round files may be OK for rough work, but they are most 
certainly not "precision" tools either. Controlling them is difficult. Still, they 
have their uses.

Jewelers files are very much smaller, and far "finer", than rat-tail or 1/2 round 
files, and are good for more "precision" work. I have a set and use them 
when needed.

I also use hole-saws when appropriate. However, one really should use a 
drill-press when using them on metal.

YMMV.

Ken W7EKB