Adoom

Making a part for power hacksaw practical?

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So I bought an old as power hacksaw. It works okay, but it's missing a piece of the mechanism that lifts the blade on the backstroke.

The saw has no branding, but it's a model that has been sold under many names. Sears, Craftsman, Dunlap, Excell, Atlas, Covel, etc...

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The missing part is the ratchet feed block. It's intended to be replaced when it wears. But it's NLA.

It looks like this.

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The manufacturer released the engineering drawing for the part after it was discontinued. I wondered if there is enough information to model it to use a cnc mill to replicate it? And would it be economical to make?

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Problem with making that is the teeth, would need to grind a tool specifically, or if you're moneybags would be a simple wirecut job....

Very simple part to draw up, the tooth detail is a bit light but could fudge it easy enough.

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Maybe I will put it in the too hard basket. The previous owner said he could never get the lift function to work, but he had cut a shitload with it despite that.

 

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19 hours ago, peteretep said:

could get a few of them laser cut  from 5mm plate and stick/weld them together? The teeth don't need to be super accurate?

This is by far the easiest/cheapest way. Just draw it up in cad so that u dont have to pay someone else to do it. 

Maybe go thinner than 5mm even to help keep as much detail as possible? Even 2mm would be fine.

 

Edit.

And then send the plates to heat treatments

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Just now, peteretep said:

TBH I have been living in the dark ages, I haven’t seen an automatically lifting saw

You must be, this thing is from the 50's

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1 minute ago, flyingbrick said:

Do you need someone to draw it? I'll do it for you.

 

If you want to, that would be great! I've never got anything laser cut, so I need to find out if there is someplace near me/work that does it.

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How much do you think it will cost if I got 12 at 2mm thick to stack and make the ~1inch width?

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To be honest i have no idea- no drama for me to get you a price on monday tho. Ya may even be surprised.

Im no material expert but reckon gauge plate could be great for this as the laser will make the cut edges super super hard. (Just experience has shown this to be the case)

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14 hours ago, flyingbrick said:

To be honest i have no idea- no drama for me to get you a price on monday tho. Ya may even be surprised.

Im no material expert but reckon gauge plate could be great for this as the laser will make the cut edges super super hard. (Just experience has shown this to be the case)

Cool, I'll wait for Monday then. Thanks!

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On ‎4‎/‎08‎/‎2018 at 20:19, Adoom said:

If you want to, that would be great! I've never got anything laser cut, so I need to find out if there is someplace near me/work that does it.

There is a place out the hutt valley

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i would thing that wirecut would be the best way to produce the teeth profile. 

cutting 10 plates over getting one fat one would be more cost, plus all the fucking around gettin them together.  but the laser wont do so well with that profile over a real thick plate unless it is a new fibre type will be better.

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