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cutting holes in old brittle plastic 200 1993

Merry Christmas Everyone !

I'm replacing the damaged center console in my '93 245 with a unit from an '89 and i need to cut 2 holes in the forward face of it for mounting the electric mirror control switches.

I test drilled the plastic on the broken console with various wood and metal drill bits I have but each and every bit I tried cracked the plastic.

I'm wondering if I need to "grind" them out with a Dremel tool ?

All tips and suggestions are welcome :-)

John
Raleigh, NC








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    cutting holes in old brittle plastic 200 1993

    here is one on ebay for 40 bucks.
    http://www.ebay.com/itm/volvo-240-Center-Console-E-Brake-Cover-Black-/281541304394?pt=Motors_Car_Truck_Parts_Accessories&hash=item418d2b604a&vxp=mtr

    just realized that is does not have the seat heater switches. It must be from an earlier model.








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    cutting holes in old brittle plastic 200 1993

    The shallow angle on the drill bit is key. A regular drill self feeds and pulls into the plastic up too fast and breaks it. Router bit in a drill and a steady hand.

    Greg








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    cutting holes in old brittle plastic 200 1993

    Hi John,

    Your experience brought back a warm memory asking my grandfather the same question. He replied by giving me an 1/8" drill bit he advised me to keep for plastic (styrene) because it was ground at a shallower angle.

    That was in 1959, and kids did not own power drills then, much less Dremel tools. Today I would not hesitate to use the Dremel for that. Lowest speed carbide burr or router, emphasis on the low speed so it doesn't melt and clog.

    Edit: I just read the post from Amarin, and I agree with his steps exactly and have used this melt through approach as well. Depends on what tools one has at hand. It takes about as long to clean the melted plastic from a soldering iron as it does to pick the solidified stuff from an overheated carbide burr.
    --
    Art Benstein near Baltimore

    Merry Christmas!








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    cutting holes in old brittle plastic 200 1993

    Hi,

    I'm not sure if you'll agree with me on this one, sometimes I'd just poke my hot soldering iron to melt a hole thru plastic. Be sure to trim the hole's edges afterwards with nail clipper/file/wire cutter after it had cooled down. And clean back the hot iron's tip afterwards. Take care not to inhale the plastic fumes too much. This is only for screw hole.

    If this hole is meant to be on the cosmetic faceplate and rectangular in shape (to put in a rectangle switch maybe), I would use an art knife to cut deeply into the plastic, outlining the rectangle. Then I would cut deeper and deeper using the same knife till it goes thru to the other side. Don't press too hard the plastic could crack. Time consuming with sore hands maybe but you could wrap the art knife with small towel to make handling more comfortable.

    Happy holidays!
    Amarin.







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