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Atomic SX10 mounting question

post #1 of 13
Thread Starter 
I bent one my 04/05 SX10's last year. I just picked up a new set (04/05) on Ebay for $129.00.

I want to mount my original 6-14 race bindings to the new skis. They have the integrated mounting plate with marked holes. I have the required Pozi drive screwdriver.

My question is what size drill bit should I use? It doesn't look like I need to tap the holes, as the material seems like plastic all the way through.
post #2 of 13
Thread Starter 

Still looking for help

Getting the skis tomorrow.
post #3 of 13
4.1x9mm these are available at many online sites. This is from Tognar toolworks. It is the 2nd bit from the top in the photo.

BINDING DRILL BITS

Made of tough high speed steel, these bits are ideal for mounting bindings. They fit any mounting jig, are a full 3" long, and will countersink the screw holes so you don't "bubble-up" the top ski surface when you tighten down the screw. The 3.6 x 9mm bit is best for most adult alpine skis; the 4.1 x 9mm bit is for metal laminate alpine skis or those with a metal or titanal mounting plate internally located in the ski; the 3.5 x 7mm bit is for junior alpine skis; and the 3.6 x 14.5mm bit is for adult nordic (x-c) skis.
Item #SPK-100330 4.1 x 9mm bit: $12.95 Quantity: Item #SPK-100315
post #4 of 13
Quote:
Originally Posted by Cevan View Post
I bent one my 04/05 SX10's last year. I just picked up a new set (04/05) on Ebay for $129.00.

I want to mount my original 6-14 race bindings to the new skis. They have the integrated mounting plate with marked holes. I have the required Pozi drive screwdriver.

My question is what size drill bit should I use? It doesn't look like I need to tap the holes, as the material seems like plastic all the way through.
Isn't the plate predrilled for the Race binding?
post #5 of 13
Thread Starter 
The middle holes are not pre-drilled, but there are dimples where you would drill. The material appears to be plastic, so why do I need a special bit?
post #6 of 13
Use a 9/64" bit if it's straight plastic and you are not going to tap the holes. Or use 5/32" if you are drilling into metal layers, and tap with a #12AB tap (binding screw thread). Be prepared for the material to pucker if you're not using a stepped binding bit. One way to avoid the pucker is to use the larger bit and tap the holes, even if no metal layer is involved. I happen to always follow that procedure (metal or no metal) because it results in a cleaner mount IMO, and makes it all but impossible to strip out the holes.
post #7 of 13
Quote:
Originally Posted by Cevan View Post
The middle holes are not pre-drilled, but there are dimples where you would drill. The material appears to be plastic, so why do I need a special bit?
correct depth and diameter. You don't want to drill too deep or to big. Screws are self tapping. You don't need to tap if you use the 4.1X9mm

Same Bit I have used on all Atomic plates on the advice of pro ski shop. Had a couple pair of SL11M that had retail plate predrilled for Neox and mounted Race bindings on them. Used this bit; worked perfectly.
post #8 of 13
Thread Starter 
I want to mount them tonight as I will be skiing on Friday. I have a 5/32 bit and a drill press so I can set the depth precisely. Will this work, given that out of the 6 screws that hold the bindings on one ski, 4 of them are already drilled?
post #9 of 13
I don't see why not just going for it and remembering you can always drill deeper and wider, versus the other way around.

At the bottom of this Dynafit binding mounting page at Wildsnow, Lou provides some tips on drill bit sizes:
Quote:
In my experience, it's okay to use the slightly larger 5/32 inch drill bit as suggested above, without a tap. If you do so, especially with non-metal skis, just be careful as you twist the screws in so you don't over-tighten them and strip the holes, and use epoxy in the holes since they're slightly oversized. (to remove epoxied screws, lightly heat with soldering iron before twisting out).
And a thread at BackcountryWorld with additional insights.

FTR: 4.1 mm ~ 5/32"
3.5mm ~ 9/64"

HTH
post #10 of 13
Quote:
Originally Posted by Cevan View Post
I want to mount them tonight as I will be skiing on Friday. I have a 5/32 bit and a drill press so I can set the depth precisely. Will this work, given that out of the 6 screws that hold the bindings on one ski, 4 of them are already drilled?
5/32" will work fine as a pilot hole for the screw. drill to a depth of 9mm or as close as possible. or 11/32" which will be close.
post #11 of 13
Quote:
Originally Posted by Cevan View Post
I want to mount them tonight as I will be skiing on Friday. I have a 5/32 bit and a drill press so I can set the depth precisely. Will this work, given that out of the 6 screws that hold the bindings on one ski, 4 of them are already drilled?
Is that plate predrilled for Neox bindings. It's been awhile since I mounted a plate predrilled for Neox with Race bindings but don't you have to drill more then 2 holes for the Race binding?
post #12 of 13
Thread Starter 
Actually, I had to drill all the holes (3 front, 4 rear), but the mounting plates had dimples so it was just a matter of using a 5/32 bit with my drill press, which allowed me to set the depth. Took about 1/2 hour. The material I drilled out was all plastic so I figured no tapping would be required.
post #13 of 13
Quote:
Originally Posted by Cevan View Post
Actually, I had to drill all the holes (3 front, 4 rear), but the mounting plates had dimples so it was just a matter of using a 5/32 bit with my drill press, which allowed me to set the depth. Took about 1/2 hour. The material I drilled out was all plastic so I figured no tapping would be required.
I thought so! Glad it worked out!
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