power hacksaw

[andrew bunnParticipant @andrewbunn28453]

Hello

I have just salvaged a Qualters and Smith 6" power hacksaw. It seems to be in good condition. However the Motor is missing. I know these machines are wired for 3 phase but could anybody tell me what size the motor would normally be and what the outside diameter of the drive pulley ? I would like it to cut about 100 strokes a minute if possible.

Thank you

[andrew bunnParticipant @andrewbunn28453]

Qualters and smith

[Ian S CParticipant @iansc]

100 per min a wee bit fast, I'd look at about 80. You'd be OK with a 1450/4 pole half horse power single phase motor. Ian S C

[andrew bunnParticipant @andrewbunn28453]

Thanks Ian

Any idea about the size of the pulley I should fit . The driven pulley is 240mm or 220mm. I was thinking of something around 70mm to 85mm

Thanks

[Clive FosterParticipant @clivefoster55965]

For what its worth my Vee belt drive Manchester Rapidor has a two stage reduction coming out around 13 or 14 to 1 reduction. Approximate pulley diameters are 80 mm on motor and intermediate shaft, driving 260 on the intermediate and 300 on the saw crank. Wave a tape at it guesstimate as the saw sits at the end of my big lathe and I'd need to pull it out and unhitch a cover to measure properly.

When you get it going do remeber to bolt it down as they tend to wander around a bit if unrestained. The Rapidor moved a couple of inches per hour of operation on a smooth "underfloor boarding" floor before being restrained.

Clive

[_Paul_Participant @_paul_]

Well done they are good robust machines but a little on the heavy side.

You will find 1/2 HP is not enough it may turn the machine over but the cut speed will drop under load.

My 6" Qualters & Smith has a 1&1/2 hp 1425 rpm? single phase motor and cuts well with it, I will check the pulley sizes for you tomorrow.

Once I can find the manual I can tell you what the recommended cut speed is.

Regards

Paul

[bebo beboParticipant @bebobebo85532]

I have no Idea about t the size of the pulley of this.

[andrew bunnParticipant @andrewbunn28453]

Hi

Thanks to eveybody who posted help. I have got a 11/5 hp motor single phase motor but its base foot is 100mm between centres so I will have to make an adaptor plate because the casting mounts on the saw are 80mm between centres.

[oldveloParticipant @oldvelo]

Hi Andrew Trolled up a bit of info on Qualters And Smith Power Hacksaws.

The Bulldog 150 can be viewed working here-

http://www.youtube.com/watch?v=isuPXWE1wyM

Features
Totally Enclosed Drive
Two Cutting Speeds
Fully Adjustable Feed
Hydraulic Relief on return Stroke
Bow raises automatically and stops motor on completion of cut.
Heavy Duty Quick acting vice allows location to be made of 90-45degrees
Adjustable Bar Stand

Safety features
The machinery drive doors if opened when the motors are running ,the motors will stop by safety switches on each door
Emergency stop on the starter
Automatic motor stop after the saw bow has raised to its start position

Specification
Main motor :3ph 1hp
Coolant motor :3PH 0.8
Speed:100 and 150 strokes /min
Capacity : @ 90degrees 150mm :@ 45 degrees 90mm
Weight : 280kgs approx.
Sawblade:14" x 1 " Size : 46.75" (1.187mm) L x 20.5"(520mm) W x 36" ( 914mm) H approx.

[Ian S CParticipant @iansc]

My 80 strokes was without coolant fluid. Ian S C

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