For some jig saws, Bosch for one, blades are available with teeth 
pointing either, or pointed straight up in a neutral position. Also 
blades with an abrasive cutting edge are available. Generally the rule 
for saw tooth spacing is 3 teeth in contact with work at one time. Slow 
steady feed rates are good too. The hole in the table should be very 
minimal, just enough to get the blade through, then the piece will be 
less likely to catch, bow, and jamb to the blade. It would also be 
possible to provide something (little roller ??) from above to hold the 
piece down.

Brooke Clarke wrote:
> Hi John:
>
> I went through two jigsaws with metal blades.  I chose the model that 
> has mounting nuts on skid plate and used them to mounted the saw below 
> my garage workbench.  A problem was that when cutting very small boards 
> the blade would lift the board up off the table, Ouch.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
>
>
>   
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