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Making a trepanning drill https://www.airgunforum.ca/forums/topic89480.html |
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Author: | airmec [ Sun Sep 12, 2021 5:11 am ] | ||||
Post subject: | Making a trepanning drill | ||||
I started making one for a 1 1/8'' hole I need to drill in a piece of 6061-T6 aluminum. Trepanning drills have a few interesting features I wanted to try: less power needed to drill a big hole, less chips made and a core left for other projects, and less time used for drilling the hole. I used an old Morse #3 dead center I had as the shank, I annealed the end and made 5/8''-18 NF threads, 3/4'' in length. There's a shoulder 1/8'' long and 3/4'' OD to center the drill body, and an Oring to seal if I ever use coolant or air. BTW the grey-ish color is due to tungsten disulphide dry powder burnished on the parts. The body is made from a piece of an Iscar 1 1/4'' boring bar (4140 steel?), turned down to 1.075'' and drilled with a 13/16'' twist drill, with the front end @ 1.100''. Total body length is 6 7/8'', with a maximum (inside) depth of cut of 5 3/4''. The core left should be 0.775''-0.780'' OD. The base is threaded the same 5/8''-18 NF as the shank, and I left 1'' of the original flats for ease of unscrewing the body. The flutes have been cut using a 1/2'' HSS end mill, they are 0.075'' deep and 0.050'' off the center line of the tool. I actually followed Bob Sterne's tutorial on making a reamer to cut the flutes . I still need to machine flats on the shank for a box end wrench, make a cutting tooth blank out of HSS, also cut the teeth seats in the front end of the body. Then it'lll be nickel/silver soldering the teeth and grinding them to final shape. I'd need to know about the angles if anyone has some advice? I know I need to grind relief angles, but what would be good angles for aluminum? BTW I designed my tool based on the work of this great British fellow: https://www.youtube.com/watch?v=pAactI93w6U
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Author: | YepYep [ Sun Sep 12, 2021 6:54 am ] |
Post subject: | Re: Making a trepanning drill |
Looks good and understand the idea~ great job! |
Author: | Headdamage [ Sun Sep 12, 2021 3:23 pm ] |
Post subject: | Re: Making a trepanning drill |
That makes more sense, I was wondering why someone would be asking about cranial surgery |
Author: | notec [ Sun Sep 12, 2021 8:24 pm ] |
Post subject: | Re: Making a trepanning drill |
There is no better feeling than making a tool instead of buying one. Great job!! |
Author: | ricksplace [ Mon Sep 13, 2021 4:25 am ] |
Post subject: | Re: Making a trepanning drill |
notec wrote: There is no better feeling than making a tool instead of buying one. Great job!! Home shop machinists often spend more time making esoteric tools than actually using them. I made a ball turning attachment for my South Bend. After messing around with it learning how to use it, I think I used it once for a job. Making a complex tool is often more rewarding than using it! Beautiful work, as usual. |
Author: | notec [ Mon Sep 13, 2021 2:52 pm ] |
Post subject: | Re: Making a trepanning drill |
ricksplace wrote: notec wrote: There is no better feeling than making a tool instead of buying one. Great job!! Home shop machinists often spend more time making esoteric tools than actually using them. I made a ball turning attachment for my South Bend. After messing around with it learning how to use it, I think I used it once for a job. Making a complex tool is often more rewarding than using it! Beautiful work, as usual. LOL my shop is full of one time use only tools that I have made over the years........as can be seen by the amount of rust on them |
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