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Hemingway Hacksaw

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David George 103/02/2019 17:04:46
avatar
915 forum posts
307 photos

Looking a very nice piece of work.

David

Mark Elen 108/02/2019 10:28:18
107 forum posts
179 photos

Hi David,

Many thanks for your kind comments.

I have got a bit more done in the last few days. The con rod is complete, I reamed out the 1/2" hole and bored out the 5/8"

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Then I decided to start work on the slide bar retainers. These took a bit of working out how to hold them as the castings were not square. I had to square up one side and make up a set of soft jaws to hold these whilst I worked on them.

The bosses for the screws didn't line up too well either. I decided to use the dro, line up centre on the raised portion on the back of the casting, then place the holes as best I could in the bosses.

The holes are correctly placed at 2" centres (50.8mm) but they don't line up in the bosses very well.

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Cheers

Mark

Mark Elen 110/02/2019 17:08:57
107 forum posts
179 photos

One of the things that I have not been looking forward to was machining the bow. I don’t know why now. I got stuck into it last night, doing the slides first, then today I have set it up on the angle plate and drilled the boss.

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Don’t look too closely at the spirit level on the square... I still need to level the mill.

Cheers

Mark

Mark Elen 111/02/2019 22:23:43
107 forum posts
179 photos

I got the hole drilled in the boss, then set back up on the table using the slide bar and clamps to hold the bow in correct alignment. I took really light cuts, because the bow is just hanging in free space.

I milled off the ends and the waste in the middle, made up the threaded adjuster, I need to mill half of the end off now and drill for the pin. I have marked up for the M5 screws to hold the blade, just need to drill and tap.

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I have had to go 'off piste' with the adjuster screw, putting a 120 degree cone on the end. The drawings/casting is a bit out. the boss should be 1" long, but just skimming the end square, left it 3/4". I drilled down 39mm, the drawings called for 1 3/8" (34.93mm) even with this adjustment, if I had left the adjuster square and drilled for the pin at 1/4" the blade would not have fitted.

At 1/4" from the tip of the cone, the blade should fit with a little slack.

Cheers

Mark.

Simon Birt18/02/2019 14:28:10
7 forum posts
3 photos

Just fell across this. I built one of these last year it was an interesting project. It marked my return to model engineering after a nearly 20 year gap. Not sure if you have done it yet but the fit between the saw casting bearing surfaces and the arm that it runs on needs to be on the tight side. Mine makes a bit of a clunk when cutting as it changes direction. On reflection I would machine it within a few thou and then hand fit until it just slide on the bar. It was surprising how it loosened up jouring the running in process.

I’m very please overall, it cuts very well and is still on the original blade after 6 months.

Simon

Simon Birt18/02/2019 14:53:47
7 forum posts
3 photos

Here is a picture

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not done it yet18/02/2019 16:14:44
3353 forum posts
11 photos

He he! If that pic is a recent one, you’ve not used it a lotsmiley_

Looks good, btw.

Simon Birt18/02/2019 17:54:27
7 forum posts
3 photos

It was taken after it was finished, it is now a bit less shiny, not sure if is appropriate to polish a hack saw.

Ruddxi14/09/2019 18:27:33
1 forum posts

I've decided im going to do this project myself and will be making an order very soon.

so i started searching for more info on the saw and found your build! very nicely done so far, and now i cant wait to get started myself!

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