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Thread: Power Hacksaws V's Bandsaws
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20th May 2013, 06:44 PM #91Philomath in training
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Christian's suggestion was a good one - a suitable lump of nylon would be around $17. Will it last? Provided that it does not get any shock loading Dotmar think it could well do. For that price it's worth trying. Once the principle is proven, then there's the option of trying to sell the house to buy a lump of bronze.
Michael
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20th May 2013, 08:47 PM #92Most Valued Member
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OK. Here are some more pics.
Pic 1: The motor and pulley system. It seems like a solid pulley and so no speed control there....
Pic 2: Shows the motor mounting and just above it is the small single pulley with a rectangular output shaft. Looks like it should connect to the speedo?
Pic 3: The cutting guide. It has the hydraulic valve with the T piece adjustment on it. It's also separate from the coolant line. Don't know what that is for?
Pic 4: different angle of the same hydraulic valve in pic 3
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Simon
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20th May 2013, 09:03 PM #93Most Valued Member
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And some more pics:
Pic 1: Another pic of the saw blade guide with the hydraulic adjustment valve
Pic 2: The pulley attached to the gearbox
Pic 3: A CI flywheel that may fit the bill as a worm gear blank. That will be plan C (or D)
Pic 4: motor name plate. It appears to be a 2 speed 3 phase motor (1375 /min 2770/min) It also has 7 wires going to it including earth
Pic 5: Motor junction box
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There is a plate on the saw saying "Refurbished By......". I'm wondering it it has been modified at some stage and they have replace a variable speed with a 2 speed motor. The main switch has a 3 position switch marked 0, 1, 2. I assume this selects between the two speeds of the motor.
Cheers,
Simon
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20th May 2013, 09:23 PM #94Most Valued Member
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"Pic 3: The cutting guide. It has the hydraulic valve with the T piece adjustment on it. It's also separate from the coolant line. Don't know what that is for?"
It has to be a flow control valve and I assume it is for the down feed, does that pipe go to the tank
or to another valve? maybe this one http://www.woodworkforums.com/attach...-05-37_186.jpg I can only see that that valve is attached to a return pipe to the oil tank
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20th May 2013, 09:39 PM #95
With the new "The Foundry" Forum it should be a lot cheaper for someone to cast a suitable piece of brass or bronze. Scrap is usually cheap.
Dean
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20th May 2013, 09:40 PM #96Most Valued Member
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And where does the pressure pipe out of the pump go to ?
That should go to a control valve
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20th May 2013, 09:46 PM #97Most Valued Member
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Hi Shed,
There is actually another valve (flow control hydraulic valve) that I have not taken a pic of. I thought that was for the down feed. Surely there would not be two down feed control valves?
Yes that is yet another (3 in total) on the hydraulic pump. Maybe the one on the hydraulic pump is a set and forget (given its in a difficult position) that is designed to be adjusted on set up to regulate the maximum possible flow?
Actually, the flow control valve at the pump does not control flow to the ram but it regulates the amount of fluid that by passes as it just goes back into the return.
Maybe it's two systems we are looking at. There must be a valve to regulate the downfeed which I assume does not require the pump to be running, it just allow fluid to be gravity feed and pushed out through the weight of the saw. Once the saw cuts through the material and triggers the preset limit switch, it must stop the saw motor and starts the hydraulic pump to lift the saw?
Cheers,
Simon
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20th May 2013, 09:53 PM #98Most Valued Member
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"There is actually another valve (flow control hydraulic valve) that I have not taken a pic of."
c'mon......cough it up Simon
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20th May 2013, 10:14 PM #99Philomath in training
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I agree with the rest, that the valve on the blade guide is just there for a place to mount it. The top banjo is fluid one way, the bottom banjo (missing the hose) is fluid the other way.
The motor could well originally have been 2 speed, but looking that the motor shaft and the pulley on it, I suspect that the pulley has been changed. A toothed belt like that is usually to prevent belt slip. I can't see why that would be important on a bandsaw. I'm wondering whether one of the hydraulic valves is for speed control and it started misbehaving so it was "refurbished" away. If they were only cutting steel they would only need one or perhaps two speeds. Perhaps along the lines of a hydraulic cylinder pushing against a belt pulley via a thrust bearing. The speedo gives the impression of continuously variable cutting speeds.
Shed posted a link to the manufacturer (http://www.woodworkforums.com/f65/po...ml#post1649819). It would be worth contacting them to see if they had an operating manual or better still a maintenance manual with some schematics and drawings.
Michael
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20th May 2013, 10:16 PM #100Most Valued Member
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Ok OK.
I'll duck out to the shed. I'll post 3 pics, one of each flow control valve.......
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20th May 2013, 10:27 PM #101Most Valued Member
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Michael just maybe that handle/wheel that appears to adjust the belt tension via the motor mount was originally to adjust the motor because it had variable drive pulley's on it ?
Why else would it have such an elaborate and convenient handle to adjust the belt tension ?
edit: you can see the photo of the speed control handle on this one in picture 5, it looks like the speedo is also missing this one but the plaque is still there RESALE.INFO photosLast edited by shedhappens; 20th May 2013 at 10:50 PM. Reason: more stuph
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20th May 2013, 10:36 PM #102
Where are the pictures?
A circuit (flow?) diagram would be useful as well. We don't want much!
Dean
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20th May 2013, 10:52 PM #103Most Valued Member
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OK. More pics:
Pic 1: One of the valves. I think this lives on the top of the machine. There is a hole at the top that matches the valve assembly and it's similar to the pics of others of the same model.
Pic 2: The other valve on the saw guide. This is connected straight from the hydraulic pump. I'm wondering if it's some sort of blade tensioning. The adjustment on top seems to adjust flow/pressure via a small tube into the guide.
Pic 3: The hydraulic pump. Top left is return hose, Bottom right is outlet (goes to saw guide valve in previous pic) flexible line is power to the motor and the valve seems to regulate flow from the output back to the return. Perhaps it's a pressure relief valve?
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20th May 2013, 11:00 PM #104Most Valued Member
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And more pics:
Pic 1: The ram with return hose still attached.
Pic 2: The main motor mount. Took a pic of this cause people with eagle eyes will see that it is held with 2 bolts AND then 2 machine screws. The two machine screws look to be retro fitted and gives me the impression of a modified motor mount because of a replacement motor at some stage.
Pic 3: Feed speed gauge
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Cheers,
Simon
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20th May 2013, 11:04 PM #105Most Valued Member
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