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Meba Bandsaw Cutting Direction ?

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philf:

--- Quote from: mattinker on August 05, 2016, 08:30:20 AM ---This reversing the direction of cut is very interesting, My cheepo Clarke 6X4 band-saw has a tendency to derail, which despite my concerted efforts still plagues me! I've trued up the wheels, checked wheel alignment and made a hydraulic down feed, all to no avail! I'm going to see if I can reverse the motor!

Thanks John for pointing it out!

Regards, Matthew

--- End quote ---

Matthew,

If, like mine, your 6 x 4 has the saw table attachment you won't be able to use it if you reverse the motor (and blade).  :(

Phil.

mattinker:
Phil,

I have virtually never used the saw table attachment, I use either my plasma cutter or extra thin cutting disks for that kind of cut. I would however be very pleased if I could get over the blade derailing.

Thank you for your thought! Regards, Matthew.

awemawson:
The 'Tee' piece for the coolant hoses arrived in the morning post, so it was fitted in short order. However the first (right hand) nozzle hogged all the flow, so it proved necessary to push a 'flow restrictor' down it to allow the left hand nozzle to receive coolant. This is just a bar of acrylic with a co-axial hole drilled down it. It took a few iterations to balance the flow between left and right by choosing different hole sizes.

awemawson:
Fitted the replacement Vee belt - I reckon failure was pretty imminent !

This now gives me the choice of approx 60 or 120 foot per minute on my 8 tpi blade. Anyone care to comment on what speeds are suitable for what cross section and materials ?

John Stevenson:
Andrew,
My saw should have a motor that drive a variable speed friction gearbox, however these are very fragile and when I went to collect my machine the guy was very apologetic and wanted to back out of the sale as someone had removed the gearbox without his knowledge for use on one of their existing machines.
However I managed to still buy it but at a reduced price as i was sure I could sort this out.

Now the company I was working for at the time had a Startright band saw, bough new just before I joined. I believe this was a 4 or 5 speed belt drive mode but in all the time I had been there no one had ever change the speed on this and it was used for everything.

So I stuck a rev counter on it and measured the speed, then worked out ft per minute, went home and did the maths on mine [ can't remember what the answer was ] but worked out that I needed about a 75 rev motor.
So raided the machinery scrap yard at work and found a 75 rev output in line geared motor.
New mounting plate and coupling and it's been on there since I fitted it over 20 odd years ago.

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