The FIRST Q&A system has answered this.
In short: NO, you can NOT use any cylinder bore-stroke combination UNLESS it is shown in the 2007 FIRST Pneumatics Manual. (IOW, the FIRST Manual takes precedence over the Bimba ordering system.)
Yup, there was an error on the Bimba website, that allowed teams to order other combinations. That was unfortunate. However, I read in another thread that Bimba has sent out letters apologizing to teams that did order illegal combinations for the error, and are offering free exchanges for "legit cylinders", as defined by the manual. (Yea Bimba, for acting so quickly on this!)
Here's the Q&A entry's answer, when someone from team 63 noted that 1.5" x 24" (1724-DP) and 2" x 18" (3118-DXP) were "orderable", and asked this very question:
>---
> Re: Rule 105 Pneumatic Cylinders
> Posted by GDC at 01/13/2007 12:20:05 am
> As specified in Rule <R105>, additional pistons "must be identical to those listed on the
> Pneumatic Components Order form (i.e. same part numbers)." Parts 1724-DP and 3118-DXP
> are not available on the Pneumatics Components Order Form, and therefore are not permitted.
>---
Therefore, in this context, the "Pneumatics Components Order Form" is the one in the
Manual, and NOT the one on the online ordering site.
So... Be
sure to design your pneumatics system to
ONLY use cylinder bore-stroke combinations from the 2007 FIRST Pneumatics Manual.
I hope this helps, and good luck to you!
- Keith McClary
Chief Engineer, Team 1502, "Technical Difficulties"