Planning a power hacksaw build

[sean logieParticipant @seanlogie69385]

Morning, as title says I’m planning on building a power hacksaw . I’m not sure what kind of motor to use ,dc/ac low rpm probably in the 120 rpm range or a little more and direct drive . . I’m hoping to make the saw as compact as possible.

Any thought . This will be a scavenged and used parts build .

Sean

Edited By sean logie on 21/02/2017 07:17:29

[sean logieParticipant @seanlogie69385]

[Michael Cox 1Participant @michaelcox1]

A few years back there was an article in MEW about constructing a power hacksaw and the motor used was a windscreen wiper motor.

Mike

[sean logieParticipant @seanlogie69385]

Funny you should mention a wiper motor ,I was considering one of those . How would you recommend powering it ?

Sean

[Gray62Participant @gray62]

The article referred to was in MEW 111 and 112, the author suggested a 6 amp battery charger as a power source. One of the 'simple' type of chargers would be suitable, I would suggest avoiding the intelligent chargers.

[RobboParticipant @robbo]

Once upon a time a commonly used power source for 12volt was a power supply device (name escapes me just now) from a motorhome, used when the 'home was plugged into mains on a site. Gave 12 volt at plenty of amps.

Were available cheaply on ebay

[Clive IndiaParticipant @cliveindia]

Presume you find wiper motors attractive because of the gearing? Is it too slow?

Any 12v DC power supply of the correct current rating will do – suggest 6 Amps should be enough current, but if doubtful choose 10A. They take about 3-4A when in use on a car

**LINK**

[Roger Williams 2Participant @rogerwilliams2]

Go on Utube, Myfordboy has a video on the one he made. Plans are £10.

[Michael Cox 1Participant @michaelcox1]

If you look on ebay under "dc power supplies" you will find many cheap 12 V power supplies, mostly from China.

Mike

[Ian S CParticipant @iansc]

A wiper motor direct runs at about 120 rpm, I use one for the table feed on my milling machine.

I built a hacksaw many years ago, I didn't have anything to slide the frame on, so I suspended the frame on two connecting rods about 5"/6" long, I used a 1/4hp 1450 rpm single phase induction motor, and used a 12" industrial hacksaw blade.

The only power hacksaw I have now uses a Junior Hacksaw blade.

Ian S C

[Thor 🇳🇴Participant @thor]

Hi Sean,

I built a power hacksaw some time ago – after an article I found in an old Popular Science. It uses a 250W 1450 RPM motor and belts and pulleys to reduce the speed, much like Ian's. Like you intend to do, I used old parts and material I had at hand.

Thor

[sean logieParticipant @seanlogie69385]

I’m not wanting to have a pulley system to reduce gearing ,space in my shed is at a premium the least amount of room the hacksaw takes up the better for me .

Sean

[Tractor manParticipant @tractorman]

Sean have you thought about a benchmaster junior saw? Quite a small footprint and a capable machine. I have one I'm not using but it's 3 phase at the moment but I'm sure it could take a single-phase motor. Let me know if your interested. Mick

[sean logieParticipant @seanlogie69385]

Thanks Mick will do,just fancy making one just now .

Sean

[Tractor manParticipant @tractorman]

No problems. Nice project. I have a qualified Smith Terrier which is huge for my shop but a belting saw.

[DuncParticipant @dunc]

There is another in the Feb 1976 issue of Popular Mechanics called "Low Cost Cutoff Saw You Can Make". It starts on page 109. Almost no machining; it can be built from channel & bar stock.

https://books.google.ca/books?id=B-IDAAAAMBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

I build and used this one many years ago and it cut well. Plans can be easily scaled up to take a larger blade. I made mine adjustable to accept hand hacksaw blades or even the ones meant for commercial power saws. I was able to saw 5 inch wide U-channel with it. Slow… but it got the job done.

Retired it (sold off) when I went the 4×6 bandsaw route.

[Cyril BonnettParticipant @cyrilbonnett24790]

**LINK**

[ASFParticipant @asf]

+1 for the Myfordboy saw.

Plans cheap and detailed. Uses standard blades and has pretty small footprint.

Here is one I made earlier…

[MWParticipant @mw27036]

Perhaps Sean will use the absence of a truly small powered hacksaw to design his own, built on the ingenuity of previous designs and make the most compact one ever!

This would make for M.E.W reading gold dust.

Aim high!

Michael W

[oldveloParticipant @oldvelo]

Hi Sean

I'm with Thor on this one used the principals set out by"Popular Science Magazine".

https://www.youtube.com/results?search_query=wobbly+hacksaw

more details on web site

It does not fit in the "Super Compact" category but continues to give excellent performance

Eric

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