Grinding Up Flat Bottom Drills & Using Them On The Lathe
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- เผยแพร่เมื่อ 29 ก.ย. 2024
- See how to use an ordinary drill to make into a flat-bottom drill and using it on the lathe to machine aluminium and steel.
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Great stuff... your "things to do" videos are always much much better than your "things to buy from Banggood" videos.
I can't wait to have a go at this... I've got a "nice" drill that I've completely failed to sharpen... I'll try it on that. ;)
i just flatten the bottom with the correct sized boring bar.....
I've got hundreds of duplicate drills decommissioned from Pratt and Whitney. I'm going to take this advice. I need grinding practice anyway.
Thanks Steve! Drill bits are cheaper than end mills, and good enough for countersunk cap screws.
Thanks for another very informative video Steve.
when using those do they drill in just to where the tip of the normal drill bit
has gone and stop there or will they continue in for as far as you want to push it?
In other words do they act just like and end mill and cut as far in as you want to go?
Hi You can go deeper, but I usually just 'clean-up' the back face with them. This makes the flat bottomed drill last longer between re-grinding, particularly on steel.
Great tutorial Steve. Well videoed. I noticed early in the piece you have a couple with a notched centre. I generally do this as you are invariably making a recess for a cap head bolt as shown, and have a pilot hole to work with.
I find the notch reduces chatter a bit.
But for a blind end you don't want the notch ;)
Cheers Rob
Thanks Rob. I hope to show a few other ground tools soon, now that I have managed to quieten the bench grinder a bit! Regards Steve
What's a blind end?
Flat bottomed drills you make my rockin' world go round.
balisticsquirel damn... you beat me to it!
learn how to do it correctly wth a boring bar and stop fucking up drill bits
Gives me an idea, I also have a lot of drills floating around in my shop
thanks for sharing...see you next time.
6:50 i see a wobbly wheel oh uh
WOW With the camera you could really see the RPM's change in the lathe with that hard steel. But not so much with the naked eye.
Thanks for another excellent video Steve, I'm going to practice on a few old drill bits. What is the cutting oil you use please ? All the best, keep the videos coming. Brian
Hi Brian, I just use new clean engine oil, any grade. (which I pick up cheap at my local recycle center)..I used to use a proper cutting oil, but to tell you the truth, I don't notice much difference between the two. Regards Steve
I ground my first flat bottomed drill just like you showed and it worked perfectly thanks Steve.
Great video Steve. Looks like you need to come up with a breaking system for your lathe. Thanks for the work making the videos for us. Please keep them coming.
This was my only option way back when I had no end mills... works great when the grind is nice and even. Practice certainly makes for better results... you do a fine job. The proof of the pudding is in the results!
Good demo Steve.
Thank you for the information. The video is done well. Love your accent.
Very good share Steve. Great bits to have in the shop !
Hello Steve, very nice video again. Clearly explained.
I also like to learn about how to sharpen mini lathe's bit collection. I bought mini lathe and many of its tools are badly worn.
Many newbies learning lots of new stuffs from your videos, like me. Hope you will consider my request. Thank you...!!
Hi Sanjeawa, Thanks. I hope to show more tool making and sharpening in the coming days. Regards Steve
Really good video Steve, very helpful.
Hey I wouldn't have thought of doing a countersunk hole with a flat bottomed drill. Kind of thinking outside the limits of ordinary. Thanks for the idea.
What other uses do they have? I'm new to all this so please forgive my ignorance.
Think I only have one flat drill so me thinks I'll go do some more. TFS, G :)
Hi Steve. Why do you put a small radius on the corner of the drill bit? I have been trying to figure out a reason and figure more reasons not to. I am from Canada and this week got to meet a couple from England. I asked what is English Surrey accent. She told me that she grew up in Surrey and then I understood. We had a great time talking about accents.
If you hav a collet like er32 or 40 You can hold the drill by the edges.
Good demonstration Steve. I've done a few of these in the past, but I always left the 'hook' on the cutting lips - I will try out your flattening technique next time as it looks a though it will make a stronger cutting edge. Thanks.
Hi Ian, Yes I think it does.I have never tried using one without grinding the flutes back square. I learned this grinding method back in the 70's, when we had to make all our own cutting tools. I have used it right through to where the drills were re-ground in the same way, on tool grinding machines for the CNC lathes of today.
Steve, this is probably a stupid question: forgive me, I'm new to all of this. What is the difference between a flat-bottomed drill bit and a two-flute end mill?
Hi Nicholas. A two flute end mill is designed for milling operations. A flat bottomed drill can only do what I have shown in making a drilled cone hole flat. Regards Steve
About 10 quid.
The lathe seems to have plenty of torque with the new VFD and motor .
Hi John yes the torque is excellent. The drive belt slips a bit if I push the drills a bit fast. I like it this way though, as it is a bit of a safety measure, plus it gives further indication of whether tools are ground correctly or are sharp. Regards Steve
Very well done Steve. Thank you for the information!
Thanks Glenn, I hope to show some other home ground HSS tools you should be interested in soon. Regards Steve