Gallery, Projects and General > How do I??
snapped centre drill
sparky961:
--- Quote from: woodguy on December 05, 2015, 08:17:37 PM ---Bulk Barn Franchises carry it.
--- End quote ---
That's cool... never seen it there. How is it sold? Bulk powder, boxed, liquid?
I took a few minutes to read about it and it seems to have so many uses you wonder if they all have merit.
Will_D:
Alum is Aluminium Sulphate.
Aluminium Sulphate is used and sold as a "Styptic Pencil". This is used to stop the nicks bleeding when you wet shave. Most pharmacies should still have them (I bought one only a few years ago for a couple of €)
You will get about a 1" long by 3/8" diameter piece of Alum. Crush it up and disolve in hot water.
borriss:
I read this on another forum so cannot give credit but it works.
You already have the solution at hand. Get the broken centre drill and using a cut off wheel on your angle grinder cut a groove the same width as the broken tip straight into the end of it deeper than the length of the broken tip. Then put your ground centre drill in the lathe and attack the end of the brass. You will effectively trepan around the broken piece and it will be easy to pick it out. Use the next size centre drill and recut the centre and Bob is my son's name!!!!
Borriss
borriss:
PS I just reread your thread. If this was done in the mill or drill you can still use this method but it will involve clamping it down rigidly.
A tip: Always run centre drills speed as per the tip diameter.
Hope you have success,
Borriss
SteveT:
This some times works, try heating the brass as it will expand more that the tip of the centre drill and give it a good tap from the back, also try gently moving the tip back and forward as it can some times release the trapped swaff. Best off luck
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