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bborr01
01-07-2010, 11:30 AM
Tricks of the trade department.

Several decades ago when I was a toolmaker apprentice, I was attempting to drill a rather large hole (2 or 3 inchs IIRC) in a big radial drill and the drill started walking. Walking being a form of chatter where one flute would dig in and then the other leaving an oversize hole and a terrible finish.

One of the oldtimers came by and saw what was going on and told me to "throw a rag in it".

This particular oldtimer was one of our best toolmakers, but he was also a jokester.

I suspected he was trying to put one over on the young apprentice.

Then he grabbed a shop towel, folded it into quarters, threw it between the drill and the hole, and proceeded to drill a perfect hole.

Zero chatter.

Just thought I would pass this along.

Any other unconventional shop tips out there?

Brian

vpt
01-07-2010, 11:38 AM
Thanks for sharing! Thats a nice trick!

Bill in Ky
01-07-2010, 12:24 PM
Great story!
Its sad to think that we are loosing those "old timers" and their vast wealth of knowledge.

bobhdus
01-07-2010, 12:40 PM
That's a good tip. Old trick we used to do before all these new alloy drill bits became popular (and cheaper) was to re-dress the cutting edge on cheapie masonry bits to drill through hardened steel. It's still good for the garage mechanic anyways.

Uncle O
01-07-2010, 12:50 PM
You can use a rag to force a drill to cut oversize also.

gzig5
01-07-2010, 01:44 PM
Similar to the trick that gunsmiths use when a chambering reamer chatters. They will wrap the reamer in wax paper and then cut a nice clean chamber.

Mcgyver
01-07-2010, 02:58 PM
similar trick if you have a taper drill let go and have to get it restarted. the protruded chips left at bottom make it next to impossible without them pulling the drill out...rag does the trick

radkins
01-07-2010, 03:43 PM
Ok I accept this as fact and will certainly give it a try should the need arise but does anyone have an explanation on how it works? :confused:

darryl
01-07-2010, 03:50 PM
Sure, it jams the hole up enough to prevent the drill bit from vibrating all over the place in free air, but not enough to prevent it from turning. The drill makes its own bushing out of it essentially, and that guides the bit to begin cutting a proper round hole again. It's acting as an end mill to try to clean up the chattered material and get it out of the way, and it wouldn't have enough support at the length of the bit out from the chuck without the rag in there.

Alistair Hosie
01-07-2010, 04:21 PM
If you're making love to a woman and leave your underpants on does it have the same effect?:DAlistair

John Stevenson
01-07-2010, 04:25 PM
If you're making love to a woman and leave your underpants on does it have the same effect?:DAlistair

Only if they are tapered, stainless steel underpants with TiG welded balls :rolleyes:

.

camdigger
01-07-2010, 04:40 PM
Only if they are tapered, stainless steel underpants with TiG welded balls :rolleyes:

.

Hmm, I would have thought the balls would have to have been billet aluminum:D

SpyGuy
01-07-2010, 04:40 PM
If you're making love to a woman and leave your underpants on does it have the same effect?:DAlistair

I alwasys thought that "chatter" was a desirable effect in such situations! :p

Lew Hartswick
01-07-2010, 06:21 PM
What is that "law" about posts that require any post to develop into
food, sex, or politics in so many replies?

...lew...

bhigdog
01-07-2010, 06:32 PM
If you're making love to a woman and leave your underpants on does it have the same effect?:DAlistair

Only if the tool is too small for the work piece..............Bob

darryl
01-07-2010, 07:44 PM
Depends if you're drilling, reaming, or broaching :)

Carld
01-07-2010, 07:52 PM
:eek: Would you be shiming the bore with your underwear?:confused: I don't like it rattling around anymore than others do.:mad: