DFT, Regular Caliper VS Slot Caliper

[skiep]

Why is it that on the goode web site the DFT measurement (slot caliper) is not the same as the regular caliper? When I measure my ski they are exactly the same. I understand the Jaw measurment (cutout is ground down) One other reason the jaw measurement is different is the head size is smaller than most other calipers (doesn't bridge across the concave as much)??? Keith

[ForrestGump]

Every slot caliper I've seen has about a .018 to a .020 offset from what the same measurement would be using the head of the caliper.

[Horton]

the thing about the slot is that it is fool proof. you get the same # every time. I am a HUGE fan.

[Horton]

http://www.slotcaliper.com/

[ktm300]

Yeah, the numbers published by Goode for the two different calipers can't both be correct. The slot number put the fin forward of the regular number. I set up my 9900 with the head of a regular caliper and nothing about the way the ski feels makes me want to move it forward 25/1000's to match the slot caliper number.

[Horton]

Slot and Head are close but not exactly the same.... I still say slot is the only way to go.

[skiep]

I agree. .030 more than the old way. Mid- Ride .710 regular caliper & slot caliper is .740 Keith

[Than_Bogan]

Arg! This reminds me that last year I came up with a surprisingly simple method to get very accurate (and repeatable, which is required to be accurate) DFT measurements using an ordinary caliper. But I really need to take a few pictures in order to explain it. Otherwise it will seem way more complicated than it really is.

 

So, Horton can you place someone (perhaps yourself) in charge of bugging me about this regularly until I publish it here? Thanks.

[stone88]

But how do we know which one to use. For example I took the numbers from the HO website for my A2 and then used my slot callipers but how do I know if I have I set up right?

[Horton]

Take HO # measure w/ head. Write it down. Use slot from then on.

[ForrestGump]

I'm with stupid, I mean Horton.

[jdarwin]

I used 3 different slot calipers this past weekend and each gave a different number. By standing the ski on end, I can get accurate, repeatable DFT numbers w/ my dial caliper.

[Old MS Accout]

I agree with JD. I used the same 3. Get close with shared numbers and tweak from there.