Suppliers of Descent Cylinders for Horizontal Band Saws
I replaced the downfeed control on my Wellsaw 58B with a cheapo
hydraulic cylinder, I think it was nearly the smallest dual action cylinder that Surplus Center carries. Anyway, it was about $48. From one port to the other I plumbed two branches in parallel. One has a needle valve and a cutoff (off/on) valve in series, and the other branch has a check valve. At the top where the branches rejoin, I added a little brass cylinder designed to remove air from hot water in a home heating system. This has a cap that unscrews so I can top up the fluid. (If you think about it, when the piston is all the way down then there is a different volume of fluid in the system than when the piston is all the way up because the piston rod displaces some fluid.) The brass cylinder allows the amount of fluid to vary a little. It's on the return side which is at very low pressure so it doesn't overflow - a big funnel would work just as well. In use, you set the needle valve for the rate of descent you want, then open the cutoff valve and the saw will feed down. At the end of a cut, you shut the cutoff valve and just lift the saw and the fluid runs back through the check valve and the saw stays put until you open the off/on valve again. It works very well but leaks a little - I'm going to tear it down and redo the (brass 1/4") piping using "Christy's Ultra Seal Pipe Thread Sealant" from T. Christy Enterprises, Inc.; Orange, CA; 1-800-BLU-GLUE. It's recommended for hydraulic oils, amongst many other things and claims to be "Suitable for: Gasses up to 3,000psi; Liquids up to 10,000psi." I didn't design this, I copied the hardware off a very expensive big DoAll horizontal saw. Grant Erwin Kirkland, Washington Steve wrote: Anyone know of a company that sells these at a reasonable price? I have one on my saw and it is done. I called the company that built the saw and they want $89.95 for a new one. I only paid $150 for the saw used so I am definately not going to spend that kind of money. Anyway, I was going to use a cylinder from Surplus Center that Roy Hauer recommended but the problem is that the rod goes all the way through the cylinder. So when I let the blade down it would hit the bed pan. I could drill a hole in the pan but it kind of defeats the purpose of having a pan in the first place. Any suggestion greatly appreciated. Thanks, Steve |
Suppliers of Descent Cylinders for Horizontal Band Saws
Have you looked at rebuilding the one you have? They may sell a
rebuild kit as well. I was quite annoyed when my Toyota power steering pump went out years ago. A new one was $500. I asked if they offered a rebuilt one, they said no. Couldn't find a rebuilt one aftermarket. After pulling it out and machining a new shaft, tracking down o-rings etc, I was hung up on one small part that attached to the removable tank. Called Toyota hoping they would have it. Parts guy tells me that it is only available in the rebuild kit ( which included the shaft as well as all the parts I had sourced and more) for twenty bucks or so. I ask why I wasn't offered this before and was told I didn't ask. Finally, a cheap hack on these to get some more use out it, is to replace the hydraulic fluid in it with heavy gear oil. Charles Steve wrote: Anyone know of a company that sells these at a reasonable price? I have one on my saw and it is done. I called the company that built the saw and they want $89.95 for a new one. I only paid $150 for the saw used so I am definately not going to spend that kind of money. Anyway, I was going to use a cylinder from Surplus Center that Roy Hauer recommended but the problem is that the rod goes all the way through the cylinder. So when I let the blade down it would hit the bed pan. I could drill a hole in the pan but it kind of defeats the purpose of having a pan in the first place. Any suggestion greatly appreciated. Thanks, Steve |
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