Drill for acrylic

Discussion in 'Equipment' started by ashburn2k, Sep 27, 2017.

  1. ashburn2k

    ashburn2k Supporting Member

    Any one can give me a pointer where to get drill for acrylic or regular ones will do? Slow speed? I tried one with my drill but it ended up to be pretty ugly and some chipped on the edges.


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  2. Coral reefer

    Coral reefer President

    What are you trying to do? Make a circular hole for a bulkhead? If so any old hole saw should work fine.
     
  3. ashburn2k

    ashburn2k Supporting Member

    Holes on acrylic sheet to plug frags in.


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  4. Coral reefer

    Coral reefer President

    Yeah that's a pain in the ass. Especially on thin acrylic. Make sure it's clamped on top of a board or something that will keep it flat.
     
  5. ashburn2k

    ashburn2k Supporting Member

    Would a drill press help?


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  6. xcaret

    xcaret Supporting Member

    Forstner bits work
     
  7. ashburn2k

    ashburn2k Supporting Member

    Forstner! Why didn’t I think of that! Thanks @xcaret!


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  8. sfsuphysics

    sfsuphysics Supporting Member

    Drill press most certainly will help. Fast speed too, but slow(ish) progression. You don't want the drill bit to catch too much
     
  9. scuzy

    scuzy Supporting Member

    I gotten drill bits from tap plastics.


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  10. DEATH BY SNU SNU

    DEATH BY SNU SNU Supporting Member

    did the plastic melt?? got too hot and melted onto your bits?
     
  11. xcaret

    xcaret Supporting Member

    With the fostner bit, the acrylic is sort of "shaved" out; it does get hot but not to a melting point. Use an old piece of wood backing the plexi so the holes end smooth. A drill press should make for a nice straight cut, a drill guide also does the job fine.
     
  12. Kensington Reefer

    Kensington Reefer Supporting Member

    High speed rotation
    Slow plunge
    Acrylic will/can melt
     
  13. yellojello

    yellojello Supporting Member

    I bought this set from Amazon: https://www.amazon.com/gp/product/B01LY6FODL/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

    I'm in North San Jose/Santa Clara if you want to borrow it. I had some small chips on a few from drilling too fast (downward pressure wise) and pressing to hard. Also got some cracks between holes same way, just need to go a little more slowly and maybe space out a little more depending on thickness of acrylic. But making your own with the bunch of bargain bin pieces from Tap Plastics is cheap and nice.
     
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  14. yellojello

    yellojello Supporting Member

    Also, I think I used the 7/16" size to try to get the smallest hole possible for the plugs I use, but after some coraline growth and other things like vermatid snails, it makes it difficult to go in and out. 1/2" would be better.
     
  15. Mr. Ugly

    Mr. Ugly Past President

    High speed, light feed, and use a backer.

    You can modify a regular bit really easily for drilling acrylic.

    IMG_0680.JPG

    Just stone the cutting edges/lips parallel to the axis to make 2 tiny flats instead of sharp rakes. Then your acrylic won't catch and shatter. Old machinist trick.
     
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  16. scuzy

    scuzy Supporting Member

    Or run the bit backwards. Reverse drill


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  17. Mr. Ugly

    Mr. Ugly Past President

    How does the physics of that work?

    Maybe for melting through, but not cutting.
     
  18. rygh

    rygh Supporting Member

    Squirt bottle of water helps a lot. Keeps bit and acrylic cool.
    I use forstners also.
     
  19. scuzy

    scuzy Supporting Member

    Try it it works start the hole then reverse your drill


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  20. Flagg37

    Flagg37 Officer at large

    I think you’re essentially melting it with friction at that point.
     

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