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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Grob Bandsaw Problem
This isn't actually a problem per se, though it may be and I just don't know it yet. I have a Grob Bandsaw at work, it is a 24" vertical model number NS24. On the front of this bandsaw at the lower right corner is a foot pedal. This foot pedal is all the way down and won't come back up. I got to looking inside the "cabinet" on the bottom half of the saw that houses the motor and pulleys and this pedal is attached to a rectangular bar that runs horizontal from front to the back of the machine, though not out the back. The bar has one pivot point, and at the end of the bar opposite the foot pedal is a vertical rod about 3/8 diameter. It runs up through the top of the lower "cabinet". Also in this assembly, right behind where the pedal bar enters the front of the "cabinet" is a hydraulic shock absorber, I don't know that that is what you actually would call it but that's exactly what is looks like, like a strut off a car. It is attached at the bottom to the bar and at the top to a solid mounting point. So, it looks to me like when you step on the pedal that rod in the back moves up and down, going in and out of the roof of the cabinet, and the shock absorber is there for the return to bring the pedal up.
Hope you followed all of that. I have already determined that the shock is no good, I disassembled this entire assembly to get the shock out and it doesn't move, it's seized. My questions before I go any deeper into fixing this would be: 1. What does this thing do? 2. Would it be of great benefit to fix it? (I have been using the machine for 6 months without it) 3. Where can I buy parts? (I tried Grob and the machine is too old) First off, this pedal is not for any type of blade speed adjust, I have seen that before and this saw is not that type of saw, this one has step pulleys for speed adjust. I was thinking maybe this is some type of brake to stop the blade when you shut the motor off? I am pretty sure that there may be pieces missing if that is the case, because I don't see any brake mechanism. Any help would be greatly appreciated. |
#2
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It's probably for a power feed of some sort. Keep looking at it and thinking
about it and googling. You'll figure it out. - GWE coolcamaro79 wrote: This isn't actually a problem per se, though it may be and I just don't know it yet. I have a Grob Bandsaw at work, it is a 24" vertical model number NS24. On the front of this bandsaw at the lower right corner is a foot pedal. This foot pedal is all the way down and won't come back up. I got to looking inside the "cabinet" on the bottom half of the saw that houses the motor and pulleys and this pedal is attached to a rectangular bar that runs horizontal from front to the back of the machine, though not out the back. The bar has one pivot point, and at the end of the bar opposite the foot pedal is a vertical rod about 3/8 diameter. It runs up through the top of the lower "cabinet". Also in this assembly, right behind where the pedal bar enters the front of the "cabinet" is a hydraulic shock absorber, I don't know that that is what you actually would call it but that's exactly what is looks like, like a strut off a car. It is attached at the bottom to the bar and at the top to a solid mounting point. So, it looks to me like when you step on the pedal that rod in the back moves up and down, going in and out of the roof of the cabinet, and the shock absorber is there for the return to bring the pedal up. Hope you followed all of that. I have already determined that the shock is no good, I disassembled this entire assembly to get the shock out and it doesn't move, it's seized. My questions before I go any deeper into fixing this would be: 1. What does this thing do? 2. Would it be of great benefit to fix it? (I have been using the machine for 6 months without it) 3. Where can I buy parts? (I tried Grob and the machine is too old) First off, this pedal is not for any type of blade speed adjust, I have seen that before and this saw is not that type of saw, this one has step pulleys for speed adjust. I was thinking maybe this is some type of brake to stop the blade when you shut the motor off? I am pretty sure that there may be pieces missing if that is the case, because I don't see any brake mechanism. Any help would be greatly appreciated. |
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I had one of the Grob 18" at the last place I worked at. The foot pedal
and the rest of it are part of the table feed system. I found a couple of pictures of the the later version of this from the HH Roberts site. They don't realy give you much and is for the the later models. On the older model there is a slider under the table that attaches to a plate that fits in the slot in the table. Ours had a flip out pawl that caught the slider and you pinned the work holders to. See the first url and look at part # 25 - 29 for the work holder parts. As for parts, you might try HH roberts but if Grob doesn't have them then you may have to improvise and make your own. The current model uses an air feed, maybe it can be retrofitted or you could rig your own. I never really used the feed on the one we had over the 13 years I worked with it, so it may be a moot point :-) I guess it will depend ont the type of work you are doing. I have used saws with the table feed and it does save a lot of wear and tear on the arms :-) It was just to much trouble to set up on the Grob to make it worth while for one off parts. http://www.hhrobertsmachinery.com/HH...Parts-4V18.jpg http://www.hhrobertsmachinery.com/HH...%2018314-A.jpg coolcamaro79 wrote: This isn't actually a problem per se, though it may be and I just don't know it yet. I have a Grob Bandsaw at work, it is a 24" vertical model number NS24. On the front of this bandsaw at the lower right corner is a foot pedal. This foot pedal is all the way down and won't come back up. I got to looking inside the "cabinet" on the bottom half of the saw that houses the motor and pulleys and this pedal is attached to a rectangular bar that runs horizontal from front to the back of the machine, though not out the back. The bar has one pivot point, and at the end of the bar opposite the foot pedal is a vertical rod about 3/8 diameter. It runs up through the top of the lower "cabinet". Also in this assembly, right behind where the pedal bar enters the front of the "cabinet" is a hydraulic shock absorber, I don't know that that is what you actually would call it but that's exactly what is looks like, like a strut off a car. It is attached at the bottom to the bar and at the top to a solid mounting point. So, it looks to me like when you step on the pedal that rod in the back moves up and down, going in and out of the roof of the cabinet, and the shock absorber is there for the return to bring the pedal up. Hope you followed all of that. I have already determined that the shock is no good, I disassembled this entire assembly to get the shock out and it doesn't move, it's seized. My questions before I go any deeper into fixing this would be: 1. What does this thing do? 2. Would it be of great benefit to fix it? (I have been using the machine for 6 months without it) 3. Where can I buy parts? (I tried Grob and the machine is too old) First off, this pedal is not for any type of blade speed adjust, I have seen that before and this saw is not that type of saw, this one has step pulleys for speed adjust. I was thinking maybe this is some type of brake to stop the blade when you shut the motor off? I am pretty sure that there may be pieces missing if that is the case, because I don't see any brake mechanism. Any help would be greatly appreciated. |
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