[TheForge] brainstorming revisited

[terry l. ridder]

hello;

i have been searching the internet and exchanging e-mails with several
hobbyist jewelers. the idea of a treadle scroll saw has come up several
times in the past. several ideas have been tried and the one which keeps
coming up is modifing a treadle sewing machine for use as a treadle
scroll saw. actual any variable speed sewing machine may work but the
older the better. the newer computer controlled sewing machines are
difficult to modify. a treadle sewing machine is preferred since when
not in use it folds away.

another approach that is far simpler yet does work. this approach uses
two pulleys, natural fibre rope, 1/4" cold rolled round, lead weights
and a wood or metal foot treadle. the type of jeweler saw used will
dictate the available cutting depth.

poor ascii picture:

 pulley -> o-------o <- pulley
           |       |
   rope -> |       | <- rope
           |       |
           |  /----- <- jeweler saw frame
           |  |    x
           |  |    x <- jeweler saw blade
           |  |    x
    ============================ <- table
           |  |    x
           |  |    x
           |  \-----
           |     | |
          www    | |
          www    | | <- jeweler saw handle
          www    | |
 lead ->  www    \ / 
 weights  www     |
          www     |
          www     | <- 1/4 cold rolled steel rod
                  |
                  |
                  |
 eye formed in -> O=========== <- foot treadle (wood or metal)
 1/4" rod with 1/4" rod      O <- 1/8 pipe with 1/4" cold rolled steel
 passing through it.              rod passing through it. held to foot
                                  treadle by conduit clamps.

 the jeweler saw frame passes through the table top via cut in slots.
 a modification to the table top would be to have a removable circular
 cut out that would only easy access to the jeweler saw.



 pressing on the foot treadle pulls the saw down and the weights up.
 release the foot treadle the weights pulls the saw up and the foot
 treadle up. jeweler saw blade stays near to 90 degrees and speed is
 controlled by the user's foot.


 a variant of the above replaces the lead weights with a spring.

 this approach has a small footprint. 16inches across and 20 inches
 deep. frame is either pvc pipe, metal, or wood.

-- 
Terry L. Ridder ><>