Pass me another drill bit this one's dull

[Syncro]

Re: Pass me another drill bit this one\'s dull

Markct:
<font color="blue">"if you let the bit chatter in the hole then yes it will dull or chip the bit" </font>

<font color="black"> </font> Yup, that sounds logical alright. Those holes I drilled last week were in an odd shaped part that was not secured very tightly to the table, and I sure did notice a lot of chatter, thanks for the tip.
BTW, if you like old machines my drill press is a WW II era Buffalo that my dad bought new. The bearings are not sealed and require oiling, but still tight and massive castings.

 

[markct]

Re: Pass me another drill bit this one\'s dull

yea our milling machine is pretty darn old too, but it works great, its a cincinati horizontal miller that someone mounted an early bridgeport head on so it could be used as a verticle miller, and you can still use the horizontal spindle also if need be, the horizontal spindle is what i use for all my heavy boring, like one inch and bigger, its a handy machine to have, my father bought it for a $150 about 15 years ago

 

[PineRidge]

Re: Pass me another drill bit this one\'s dull

$150.00 for a mill? How about I give you $300.00 for it and you double your money. /forums/images/graemlins/wink.gif Man did you ever get a bargain!

 

[markct]

Re: Pass me another drill bit this one\'s dull

you would have to offer alot more than that for me to give it up, its ended up being one of the most usefull things we have, especialy once i got some big tooling so i could use the horizontal spindle, it can bore huge holes since its extremely rigid, and the verticle spindle is great for general work, small stuff and most anything you could wanna do on a mill. my father said that he didnt even know why he realy went to look at it in the first place, it was in the local paper, no picture or description or even price, it just said "bridgeport mill" and a phone number, so he called and asked what they wanted for it and the guy wouldnt say, he just said to come look at it, so he almost wasnt gona bother going cause he figured the guy wanted thousands or whatever and at that time money was real tight around here, but he went to look at it and the guy showed how it ran and all, and my father didnt realy know alot about it since he wasnt a machinist or anything, but he asked well how much ya want for it, not figuring he would actualy be able to afford it, and the guy said, how about 150, so thats how we got it, the thing was too heavy to lift with there forklift so they slid it out on the concrete to the loading dock where a friend was able to slide it on his rollback truck, then the thing had to sit in the driveway in front of our house for a while cause my mothers car was in our garage so we couldnt get the mill into there, but eventualy he dragged it to the garage with the tractor and rolled it into place on some pipes, i dont know what it weighs but the guy that hauled it home said it felt alot heavier than the 6000 lb truck he had on his rolloff earlier, he figured close to 7000lbs, so its got alot of iron in it, old and archaic but has done alot of stuff

 

[Syncro]

Re: Pass me another drill bit this one\'s dull

Thats quite a story, like you say there ain't nothing wrong with any of that old iron. I have a 9" southbend lathe I bought used in 1962 for $25 and still have it. I was in High school at the time and the metal shop was replacing it because it was obselete way back then, well it still runs tight and has saved my a... more than a few times. No quick change gears of course, gotta manually select feed gears, but who needs to cut threads anyway. It would be an OSHA nightmare by todays standards, but its a keeper!

 

[Bluecheck546]

Re: Pass me another drill bit this one\'s dull

I haven't read all of the posts, I maybe repeating somebody, sorry, but as a tool & die maker for over 30 years I can tell you that in 99.5% cases if the chips/shavings turning blue color you turning you tool to high of a rpm. Thru my experience with any coolant there should be hardly no discoloration in the shavings, drilling dry at most should produce brown color chips at most. An other words what I always tell my trainees when I training them, any tool a specially HSS or Cobalt drill bits turn them slow and push as **** /forums/images/graemlins/grin.gif . A of course like any thing else this is a simplified.... Always the material, quality of the tool, machine condition, and setup determines how much you can push it. My 2¢

 

[PineRidge]

Re: Pass me another drill bit this one\'s dull

Today I gave it another try. I slowed the drill press down considerably, and used a sharp 3/16 inch bit to punch the pilot hole. I kept it lubed and quickly drilled through the thick draw-bar without a problem and without overheating the bit. I then stepped up to a half inch titanium bit and followed the pilot hole again keeping the bit lubed while I drilled with steady pressure on the spindle. I then finished out the hole using a 5/8 inch bit and I was finished. It cut considerably better at the lower speed that you all recommended I use. Thanks for all the advice, I learned something about drilling tough steel today.

 

[bobodu]

Re: Pass me another drill bit this one\'s dull

I bought an OLD Craftsman drill stand with a 1/2 inch monster of a drill. That puppy will drill 1/2 inch holes all day long at a wonderful slow turn. Best $20 I have spent in a long time.One of these days it's gonna break my wrist though.... /forums/images/graemlins/crazy.gif

 

[markct]

Re: Pass me another drill bit this one\'s dull

syncro, thats a nice lathe you got there, looks about the same size as my logan lathe i bought, i paid 500 for it a few years ago, it was from a guy who used it as a woodlathe to turn bowls and stuff like that, so the ways had virtualy no wear, he had owned it since it was new and had just had a toolrest on it to use with his chisels, it was in mint condition when i got it but unfourtanatly it has gotten some surface rust since our garage can be a bit humid at times of year, but it works great, i am still keeping an eye out tho for a heavy duty old lathe to use for big turning jobs