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Posted by Christopher Tidy on August 21, 2006, 5:54 pm
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zedbert@gmail.com wrote:
> 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
>
I know this thread's a bit old now, but I just noticed it and thought
I'd reply.
To me 30 strokes a minute sounds rather slow for a small machine like
this. My big Q & S power hacksaw has two speeds: 100 and 150 strokes per
minute, and it takes 16 inch blades. What makes your machine seem like
it's running way too fast?
Chris
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Posted by Nospam on August 21, 2006, 5:54 pm
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I fail to see why Ebay is classed as dreaded?
You got a bargain, you said so, so what's wrong with it?
I have bought and sold loads of stuff, doing myself and others good deals.
Why line the pockets of over priced tool dealers?
I'll wait for all the flack now..............
Bob
> zedbert@gmail.com wrote:
>> 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
>>
>
> I know this thread's a bit old now, but I just noticed it and thought I'd
> reply.
>
> To me 30 strokes a minute sounds rather slow for a small machine like
> this. My big Q & S power hacksaw has two speeds: 100 and 150 strokes per
> minute, and it takes 16 inch blades. What makes your machine seem like
> it's running way too fast?
>
> Chris
>
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Posted by Andrew Mawson on August 21, 2006, 6:02 pm
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> I fail to see why Ebay is classed as dreaded?
> You got a bargain, you said so, so what's wrong with it?
> I have bought and sold loads of stuff, doing myself and others good
deals.
> Why line the pockets of over priced tool dealers?
> I'll wait for all the flack now..............
> Bob
Yes, I tend to agree with that comment. I've done over 600
transactions on ebay (mostly as a buyer) and the vast majority have
worked out smoothly and been satisfactory. I can only bring one to
mind that was a problem. I think that the great thing about eBay is
that you can find things that otherwise would be too obscure to
locate, particularly bits of old machine tools. I have also met a
considerable number of the 'other side' to the transaction, and
without exception the ones I have met have been decent folk.
AWEM
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Posted by Nospam on August 22, 2006, 1:57 am
Please log in for more thread options Exactly, I've met some great guys, some have travelled hundreds of miles to
collect. I also have put obscure items on eBay at bargain prices more to do
someone a favour rather than make money. One example was a huge Churchill
mill, sold for £25, a Centec horizontal for £45, simply because I didn't
want them, but someone other than the scrappy did, which I hasten to add,
would have paid more!!
Bob
>
>> I fail to see why Ebay is classed as dreaded?
>> You got a bargain, you said so, so what's wrong with it?
>> I have bought and sold loads of stuff, doing myself and others good
> deals.
>> Why line the pockets of over priced tool dealers?
>> I'll wait for all the flack now..............
>> Bob
>
>
> Yes, I tend to agree with that comment. I've done over 600
> transactions on ebay (mostly as a buyer) and the vast majority have
> worked out smoothly and been satisfactory. I can only bring one to
> mind that was a problem. I think that the great thing about eBay is
> that you can find things that otherwise would be too obscure to
> locate, particularly bits of old machine tools. I have also met a
> considerable number of the 'other side' to the transaction, and
> without exception the ones I have met have been decent folk.
>
> AWEM
>
>
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Posted by on August 25, 2006, 5:33 am
Please log in for more thread options Well, the 'dread' bit was a bit of a throw-away line really, although I
have seen & heard some odd & downright nasty things about ebay.
Probably a function of too many people and a lot of profit chasing,
from the owners and some sellers.
Chris, I thought the recommended speed for cutting with a hack-saw was
60 strokes per minute, so that was what I was aiming at. My big Rapidor
donkey saw certainly runs very slowly. If yours runs at 100-150, that's
a much easier target to aim for, thanks!
I rigged it (the small saw) up to test with a 1425rpm motor, so it was
running in the hundreds of strokes per minute, just far too fast for
such a tiny blade.
I'm in the process of acquiring a car wind-screen wiper motor, which
will run much slower & be much smaller. I'll see if I can get that to
run the saw at 150rpm with out a counter shaft.
Cheers all,
Ed
Nospam wrote:
> Exactly, I've met some great guys, some have travelled hundreds of miles =
to
> collect. I also have put obscure items on eBay at bargain prices more to =
do
> someone a favour rather than make money. One example was a huge Churchill
> mill, sold for =A325, a Centec horizontal for =A345, simply because I did=
n't
> want them, but someone other than the scrappy did, which I hasten to add,
> would have paid more!!
> Bob
> >
> >> I fail to see why Ebay is classed as dreaded?
> >> You got a bargain, you said so, so what's wrong with it?
> >> I have bought and sold loads of stuff, doing myself and others good
> > deals.
> >> Why line the pockets of over priced tool dealers?
> >> I'll wait for all the flack now..............
> >> Bob
> >
> >
> > Yes, I tend to agree with that comment. I've done over 600
> > transactions on ebay (mostly as a buyer) and the vast majority have
> > worked out smoothly and been satisfactory. I can only bring one to
> > mind that was a problem. I think that the great thing about eBay is
> > that you can find things that otherwise would be too obscure to
> > locate, particularly bits of old machine tools. I have also met a
> > considerable number of the 'other side' to the transaction, and
> > without exception the ones I have met have been decent folk.
> >
> > AWEM
> >
> >
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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
>