Gingery size shaper speeds

I couldn't stand to scrap my late friends project of a small shaper,he had 80% finished it ,but unfortunateley for me he used two sets of plans.There are no gears involved in his construction and it seems he was relying in the scotch crank driven I think direct from the motor.I think a lot of reduction will be needed and advice on the speeds of these small shapers would allow me to work out the correct pulleys and intermediate pulley for reduction.

Frank

Hi Frank,

Most small Shapers have speeds in the range 40-200 strokes per minute. The actual cutting speed then varies with the stoke length used. I'm not familiar with the Gingery design but this is the FPM table for a 7" Atlas which would be similar I suspect. I don't know what adjustments are available or what cranking arrangement you intend to use but essentially - you need to be able to vary the 'foot per minute' speed to suit the material you are cutting. If the stroke length is fixed, then this will purely be down to the pulley/motor set-up.

As it states on the table - 40 to 60 FPM is a good area to aim for if your options are limited.

Regards,

IanT

Posted by Bricky 18/11/2021 12:31:24

I couldn't stand to scrap my late friends project of a small shaper,he had 80% finished it ,but
unfortunateley for me he used two sets of plans.There are no gears involved
in his construction and it seems he was relying in the scotch crank driven
I think direct from the motor.I think a lot of reduction will be needed and
advice on the speeds of these small shapers would allow me to work
out the correct pulleys and intermediate pulley for reduction.

Frank
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I have a part built shaper of a similar size to the Gingery shaper and
it is based on the Gingery machine.
I changed the drive system to use toothed belts a 5mm htd for the main
drive to the ram and a 1/5 " XL as the primary reduction.
The pulley sizes for the primary reduction are 24 /60 tooth and for the secondary
27/95 tooth.

The reduction at the input pulley seen here in the photo is about 9.96:1
with a 1425 rpm motor about 143 strokes /min, a belt reduction from the
motor of 2 to drop to 71 and 3 to 47 .An inverter drive to fill in the gaps.
I know that you will not perhaps have a similar set up but the ratios that
you need will be similar.

John

Thanks for the speed tables IanT,the tables were what I was after.

Frank

Unfortunatley Jhon P the pedestal is already made to take a skotch crank which will be driven externally and it has been made as a box so there is no way to drive it internally.I will use stepped pulleys to reduce the speed to the tables provided by Ian and it might need an intermediate pulley shaft to achieve this.Thanks to you both.

Frank