drill bit procurement; resharpen by self,replace, send out?

[Ol'fogasaurus]

http://drillpointgrinders.com/drill_sharpening.htm

After seeing this apparently I was wrong or at least weak but towards the bottom of this there are more than one angle to set the head.

https://en.wikipedia.org/wiki/Drill_bit

More information on angles.

http://www.michigandrill.com/tech/twist ... inding.php

This is where the 132 angle I posted has some credence.

https://www.drilldoctor.com/faq

The drill doctor's site.

http://www.home-security-systems-answer ... -bits.html

Using a bench grinder.

http://www.biancogianfranco.com/Agg%20A ... 20bits.pdf

This is interesting to say the least.

Lee

[Dale M.]

Basically I want to to keep it simple, just want to refresh angle already on bits... I want to drill holes, not get a phd in drill bit science...

Dale

Toss out the can of metal dullness, and buy a cheap set of bits then... You will be hours ahead, and we all know time is money...

Ahem... These are older bits and quality made even dull they have better life than new ones... Have bought 2-3 sets of new ones and they either dull real easy or heat threat is so bad they shatter without the slightest provocation... Really disappointed in the "new" bits... Time may be money, but money is also money buying $20 worth of drill bits for a $10 project...

Dale

[Leatherneck]

Lee, thank you for the info, especialy the bench grinder method. I have a lot of bits to practice with, once I get good I have 1" drill bit I don't want to screw up. Thanks again.

[Ol'fogasaurus]

Looking up drill speeds as they do make a difference in point life and other things.

https://en.wikipedia.org/wiki/Drill_bit

I found some interesting facts on the different types of drill bits and their intended use. The short discussion on the “center drill bits” as was in a previous post was something I was not aware of.

http://www.norsemandrill.com/feeds-speeds-drill.php

Drill speeds and feed rate for drill bits.

[SCOTTRODS]

Also using some cutting oil will prolong the life of Bits.

[Ol'fogasaurus]

An interesting note Scott. One of the URLs talked about that but they had a size limit thrown in as to minimum drill bit diameter to use oil with. It was something that I don't remember hearing about before.

I was kind of in a hurry this AM so I didn't get to look farther into his subject. It has been so long since I was into the processes and proceedures on the hole drilling subject.

Lee

[Ol'fogasaurus]

I tried to do a search to find the statement of (as I remember) 1/8th inch and smaller cutting oil and cooling oil wasn't (?) recommended. While reading a bunch of write-ups on the subject some things were interesting (https://en.wikipedia.org/wiki/Drilling) the talk on chips here is interesting.

One of the problems I had this last week was drilling some holes in some old metal that was work hardened, aged in the elements and covered with rust and a whole lot of things I didn't know what it was. I also was drilling holes in some cheap angle Iron (OK, Hollywood bed frames) to combine the two into some sign posts. On both of the materials I removed the protective coating and rust before I started to drill.

On the drill speed of a drill press you can usually control the speed fairly easy. One of the URLs I posted gave various speeds and the comment was made that you could drill at slower speeds than they had posted but higher speeds could be a problem due to heat build up and the flutes not being able to do their job properly. It was also mentioned about drill speeds in the smaller sizes of drill bits causing them to fracture.

Another problem I have run into was drilling at too slow of a speed and the flutes dug in and ripped the stock out of my hand (yeah, I know I should have clamped it down but sometimes when your in the heat of battle you move too quickly and forget). I've had that happen a couple of times lately and luckily I didn't get hurt (not drilling this time... something even more stupid!).

My press platen here will accommodate Tee nuts and I use them and the clamps quite often. The same with a drill press vice. I also have a center finder that goes into the chuck so I can locate the hole and clamp things in place, raise the chuck and put the drill bit in and then come down and drill the hole accurately.

Another thing I have found out the hard way is to put the drill bit fully in the chuck so only a short part of the drill bit is out and eliminating most/any flexing of the bit so you either don't fracture the bit or have it flex and not get a true straight up and down hole... when important. (the flexing of the drill bits is talked about in several of the URL I either posted or looked at)

On some of the modern battery operated drills the motor speed isn't as well controlled which is part of the problem I was having. Almost instant dulling of the bit, walking of the bit around even with a punched center and fracturing especially when soft metal and hard metal were conjoined in the area you wanted to put a hole in. Even the cheap drill bits get expensive when you break enough of them.

At one time Costco sold a fair sized box full of all sizes of TIN drill bits for a very good price. My locals stores are not stocking this now but I am sure if enough people bugged them about it they would start again. If you are interested I will post a couple of pictures so you would know what to ask for.

For what it is worth and I hope some more tricks are added for those who are just getting into the toy business/hobby.

Lee

My opinion is worth slightly less than you paid for it especially if your credit card is maxed out.

[SCOTTRODS]

Whether the "experts" recommend it or not, I recommend the Cutting oil or similar (We use a paste at the shoppe) with the Centering bits. I use them for months sometimes before someone decides to kill one for me... I keep one in my box no one else is allowed to use, the rest belong to the shop nowadays.

We should be glad this discussion is all about drill bits... Yikes the people with die grinder knowledge are even fewer and farther between. I can't lend burs to people I work with... they burn them up almost on contact due to lack of know-how. And If you think drill bits are high priced...

[Ol'fogasaurus]

I have used cutting or other oils with the smaller drill bits for both lube and for cooling purposes but one thing I have found happening with the smaller drill bits is that the "chips" (that includes the spirals that are also referred to as chips) spit out by the smaller drill bits tend to hang around the bit and hole being drilled and not get thrown to the side. The chips end up getting in the way and being so small they seem to want to fall back into the action area becoming a problem.

I remember seeing at least one one setup years ago where, instead of using their automatic oiler attachment as they would on larger dia. holes, they had some kind of rig setup that had a soft air flow (it had an adjustable valve controlled by a lever) pointed at the drill site that moved the chips out of the way and probably did some minor cooling at the same time.

Years ago, as part of my job, we had to read the many different documents, specs not only in the part but on drilling spec we called out on the drawing looking for the additional specs burried within the spec and then having to read those specs to see what was burried inside them... and so. This was done for the "data package" we had to add on the drawing; a requirement we had to do back then (this was for contracts use as new or existing bidders for a job had to have up-to-date copies of the specs, processes, proceedures, document and so on as well as their own written proceedures in order to bid on a job. FYI, the specs are embedded so they can change the embedded spec and not have to go back into each using spec and up-date it as information of processes change. That could amount to a lot of work for them but not as much for the user. I don't think it took even the government long to figure that one out.

Lee

You do learn things even by accident don't you.

Added the word "using" before the word in the last patagraph.

[Leatherneck]

OK, after reading this we broke out the Drill Doctor, took a couple tries but after getting the hang of it, we (mainly my wife) have sharpened 94 bits so far, largest being a 1/2, tried the first 5 and just samples after that but have had real good results bringing them back to useful life. Set it on 135°and going slow, they do great.