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Posted by Dave on August 21, 2006, 1:42 pm
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Ed,
The Hand drill looks familiar, I have a very similar one, I did wonder if it
was some sort of tapping machine.
When I get chance I will take a picture for you.
Dave P
> Hi all,
>
> Managed to get a small bargin on the dread ebay the other day - a teeny
> mechanical hacksaw for 99p, with a 0.125hp 240v motor - not mounted of
> course.
>
> This thing uses shortened normal hacksaw blades, it's that small. Runs
> way too fast with a 1400rpm motor, going to have to rig up a
> countershaft.
>
> What is the method of calculating the required pulley sizes for a
> countershaft? I'm guessing at a speed of say 30 strokes per min. for
> the blade, how do I get that back to the 1425 of the motor?
>
> Another thing from the same seller was an old fashioned hand-cranked
> drill press. A couple of times I've used a hand drill to make small
> holes in delicate parts, but that leaves the problem of 'wandering
> holes' - not such a prob with a press, and I can go as slow as I like.
>
> The only part that's missing is the top part of the down feed ratchet -
> that is, the part that pushes the toothed wheel around. Does anyone
> have a scrap machine lying around, or am I best to fabricate the part
> from pictures?
>
> Cheers,
>
> Ed
>
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>
> Managed to get a small bargin on the dread ebay the other day - a teeny
> mechanical hacksaw for 99p, with a 0.125hp 240v motor - not mounted of
> course.
>
> This thing uses shortened normal hacksaw blades, it's that small. Runs
> way too fast with a 1400rpm motor, going to have to rig up a
> countershaft.
>
> What is the method of calculating the required pulley sizes for a
> countershaft? I'm guessing at a speed of say 30 strokes per min. for
> the blade, how do I get that back to the 1425 of the motor?
>
> Another thing from the same seller was an old fashioned hand-cranked
> drill press. A couple of times I've used a hand drill to make small
> holes in delicate parts, but that leaves the problem of 'wandering
> holes' - not such a prob with a press, and I can go as slow as I like.
>
> The only part that's missing is the top part of the down feed ratchet -
> that is, the part that pushes the toothed wheel around. Does anyone
> have a scrap machine lying around, or am I best to fabricate the part
> from pictures?
>
> Cheers,
>
> Ed
>