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Blank problem

M

mikeh

Full Member
Joined
May 11, 2016
Posts
101
Location
Plymouth
First Name
Michael
hi
decided to drill out some acrylic blanks i received from dans.dilled the first 2 no problem.but the third one justed exploded.i drilled with 7mm pilot first then drilled for omega roller.i have drilled loads of acrylic blacks and this is the first time this has happen.any ideas what went wrong:sob::thinks:
 
rayf6604

rayf6604

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Joined
May 1, 2014
Posts
2,726
Location
Narrowboat dweller Willington, Derby
First Name
Ray
What sort of acrylic was it? My guess is polyester and because they are very brittle extra care is needed. What speed were you drilling at? For polyester I wouldn't drill at more than 400rpm or the slowest your lathe or drill will go. Personally I wouldn't drill a pilot that big. Use a centering bit instead. I have found that if a pilot hole is a bit big, when you go you the larger bit it can grab on and the force of it can be too much for the blank.


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fortress

fortress

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Joined
Apr 11, 2016
Posts
5,178
Location
Astley
First Name
John
I myself never drill a pilot hole, for the reason Ray stated, just go in slow with the right size bit. It sounds like your bit could have snatched Michael. :thinks:
 
Penpal

Penpal

Grand Master
Joined
May 26, 2013
Posts
25,342
Location
Canberra AUSTRALIA
First Name
Peter
I felt your pain but it happens, after the event is impossible to locate faults, did you check if it was glued well?

Peter.
 
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