MadModder
Gallery, Projects and General => Project Logs => Topic started by: John Stevenson on April 05, 2009, 06:21:04 AM
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Not quite peck drilling but along the same lines.
I have one somewhere and I'll try to find it for pictures but it's that simple I can do this in DoC [ Describe O CAD ]
This is meant for very small drills that have a tendency to snap easily, I built mine for drilling tiny holes in 99.9% pure copper which is a bitch to drill as it very grabby and ANY slight play in a lever operated system will do just that.
First take the holder to fit into the tailstock, usually a MT blank, fit it into the headstock and drill it and tap it something like 1/2" x 20 two inch deep, nothing critical other than it needs to be dead square.
Then make up a piece to hold a small Jacobs chuck. This needs to be 2" long of 1/2" x 20 thread with a large diameter knurled ring at the end then a short taper for the chuck.
That's it......
In use screw the two pieces together and then unscrew a few threads, offer the drill to the work and advance the drill by turning the knurled ring gently.
If the drill tries to grab it will screw the chuck BACK into the holder and not into the work and so save the drill.
I used to do a lot of very small precision drill in soft materials and came up with a few ideas that helped. but I'll do another post on them.
JS.
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What a gem John.
Using the problem to fix itself. :thumbup:
John
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Thanks for that bit of info John.
duly filled away for another project some time in the future :proj:
Stew
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I like that! :clap:
Thanks John. :thumbup:
David D
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Thank you John, years later and it is just what I need. Brilliant and simple.
Jim
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Thanks Jim! :thumbup:
I'd completely forgotten this, intended project....... :doh:
David D
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A VERY net trick there John. If I wore one I'd take my hat off to you :ddb:
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It's one of those questions: "what do you do when you have broken all your 1mm drills, can't finish the job and the shops are shut"?
Answer: make the drilling device that you have been intending to make for ages.
Obvious really. Who would make it BEFORE starting the job?
It took about an hour including the time taken to google the Dremel chuck thread size.
Jim
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Since you're holding yours in a chuck, Jim, seems like that version will work in the drill press, as well.
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No, it won't work in a drill press because you advance it by turning the bit with the thread. This one only works in the lathe.
There is another type similar to the quill in a milling machine with a ball race for you to hold and move the chuck up and down. I was actually looking for that one when I came across this much simpler one the blew me away with the ingenuity.
If you find the other one, let me know because it could be useful when small drills needing high speed are used.
Jim
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That is a very smart application.
There is a seemingly similar but for a very different application a gadget that got my imagination. It too is obivious, once you see smart idea of it: A Tapping Stand having Automatic Feed, Harold Hall
http://www.homews.co.uk/page41.html
Pekka
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.....There is another type similar to the quill in a milling machine with a ball race for you to hold and move the chuck up and down. I was actually looking for that one when I came across this much simpler one the blew me away with the ingenuity.
If you find the other one, let me know because it could be useful when small drills needing high speed are used.
Jim
Jim, I think this one (http://www.arceurotrade.co.uk/Catalogue/Chucks/Drill-Chuck-Arbors#Micro-Drill-Adaptor---JT0---12-Shank) from ArcEuroTrade may be the one you're referring to?
Dave
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Thanks Dave, that's the bunny.
Now the questions is whether to make or buy.
Jim