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.

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.

In article ,
says...

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.

Sounds like a variation on the "power" feed on old DoAll saws. The
DoAlls have large cast iron weight on a bar that sticks out the back of
the machine. A crank moves the weight along the bar to adjust feed
pressure. A system of cable and pulleys attached to the back end of bar
allows you to feed the work using various fixtures, clamps, and chains.

I'm guessing that your shock absorber is a combination spring and
hydraulic check that takes the place of the weight. Is there any sort of
adjuster on the shock?

The pictures of this saw on ebay show most of the external pieces of the
DoAll cable feed. I own an identical saw built in the mid 1940s.

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3874586874

Ned Simmons

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.