Will do.
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2x72 grinder discussion
- Thread starter Six O Two
- Start date
Ok grinder aficionados grinder motor choice advice needed.
Trying to decide if I want to spring for a 1-1/2 HP 3-phase motor.
I already have a single phase, 3450 rpm 1 HP Baldor motor like the one below. Runs perfectly.
Is the variable speed and additional 1/2 HP super desirable?
Trying to decide if I want to spring for a 1-1/2 HP 3-phase motor.
I already have a single phase, 3450 rpm 1 HP Baldor motor like the one below. Runs perfectly.
Is the variable speed and additional 1/2 HP super desirable?
Doggggboy
Ultra Member
When I built mine I messed up and bought a 1.5hp 3 phase 1750 rpm instead of 3450 rpm. Running it at 90 hz mostly solved the belt speed issue, but I do like the variable speed given that I use it for metal, wood and plastic. Unless you are making knives or running a fab shop I think you wouldn't need to move to 1.5 hp.
BaitMaster
Ultra Member
I would definately recommend variable speed.
3450 puts you up in metal territory. If you want to be able to sand wood or other materials without burning, or sharpen knives, you’ll want to turn it down.
My last one is pretty similar to that, also just 1/4 plate and 1x1 tube
only thing required to use 2x72 belts is longer arms on the platen holder and ?work shelf?. but as it is with the 2x48 belts it takes up quite a bit less space
Jswain
Joe
Build two, one with the Baldor & sell it, one with a VFD for yourself & keep.
skippyelwell
Ultra Member
skippyelwell
Ultra Member
Oh yeah, the whole shop was covered.
You do see the irony here, right ?
Oh yes. That’s why I’ll be sorting out some sort of dust collection for the grinder.
So which size/design did you order for ?Well I decided to go ahead and order the laser cut parts from Canada Laser Cutting.
Dan Dubeau
Ultra Member
Effective dust collection was a big initial driving factor behind doing my own design, as I wanted to incorporate it from the very beginning, and not just slap something on as an after thought. I kept up with the changes through the first few iterations, but some of the latest add ons made me abandon the dust collection updates, so at this point, I think it'll mostly be an add on afterthought.....Exactly what I was trying NOT to do. 
A tilting belt grinder is a lot like a compound mitre saw from a dust collecting standpoint. Difficult to contain, as there are many dust generating points that are difficult to access. The more I got thinking about this, the more I'm leaning to an overall "cubby" the grinder sits in, vs trying to contain the dust at the source with shrouds and stuff like I was initially trying for. With all the add ons, and rotating design, it really makes it challenging to do it any different.
A tilting belt grinder is a lot like a compound mitre saw from a dust collecting standpoint. Difficult to contain, as there are many dust generating points that are difficult to access. The more I got thinking about this, the more I'm leaning to an overall "cubby" the grinder sits in, vs trying to contain the dust at the source with shrouds and stuff like I was initially trying for. With all the add ons, and rotating design, it really makes it challenging to do it any different.
The one built on the Tim Welds channel
skippyelwell
Ultra Member
I've been thinking about some kind of spark catcher, once I get the machine built, the plan is to play around with some thin heating duct sheet metal to come up with a design to accommodate both vertical and horizontal grinding.
The vertical collector could be something simple like the first pic but with a wider funnel, the horizontal collector will be tougher as it has to catch the spark cone and not let it bounce back out.
Maybe something like the shape of the mitt used by Jai Alai players as in the second pic.
The inside surface of the scoop might have to have some kind of bounce reducing material to help direct the sparks down into the collection bucket.
The horizontal collector might end up just using the vertical collector tipped sideways.
Attachments
skippyelwell
Ultra Member
Just watched Phil Vandelay's last installment where he constructs dust/spark containment, I think I'll go with something like that.
Just a note for anyone thinking about building a 2x72, take note of the length of the footprint, Jer's Gen2 has a minimum length of 34", with a catch pan, 38-40".
For some reason I thought it was shorter and the spot I had planned for it is not going to work, wishing now that I had gone for a 2x48 instead.
Identical capabilities but compact.
Just a note for anyone thinking about building a 2x72, take note of the length of the footprint, Jer's Gen2 has a minimum length of 34", with a catch pan, 38-40".
For some reason I thought it was shorter and the spot I had planned for it is not going to work, wishing now that I had gone for a 2x48 instead.
Identical capabilities but compact.
