I went to a machinist's moving sale today. All the machines were spoken for, but there were some odd items there. I noticed this grinding spindle attached to a plate along with a vintage valve seat grinder portable handset. The label was missing, so I don't know what brand it is. It doesn't look like a Snap on, van Dorn, Kwik way or Black and Decker. Maybe too old. I noticed it uses o-ring pulleys that are fixed in a 1:1 configuration. The seller told me it was a tool post grinder and I could have it for $5. The spindle looked shop made and in good shape, but after I got home, I noticed that it didn't have any oil holes. I don't know what speed the handset runs, but according to the Internet, the no-load speed is usually 11000 rpm. The wheel is an Albertson&Co from Sioux and is rated at 6210 maximum rpm no load. Would the spindle slow the rotation to a safe speed, or would I need to check this with a meter? It really does wind up when it is plugged in. Note the tape around the trigger. So, the guy was right; there is a T-nut on it, although it doesn't quite fit my compound. It will be simple to modify. It might also benefit from a simple guard. $5 for a spindle anyway. Can't go wrong with that!
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Is this budget tool post grinder safe?
- Thread starter ericc
- Start date
- Joined
- Feb 2, 2013
- Messages
- 4,076
If you were so inclined, you could get an inexpensive router speed controller from Amazon or Harbor Freight.
The power plant appears to be an old router, probably exceeding 10k rpms or more
If the setup feels safe, then run it!
The power plant appears to be an old router, probably exceeding 10k rpms or more
If the setup feels safe, then run it!
- Joined
- Feb 7, 2013
- Messages
- 2,549
Throughout life, each of us determines what is safe and what is not. I'm sure we all have done
some unsafe things in the past. Learning is mixed in too since a bad outcome will change behaviors.
Real dangerous stuff has the potential to cull out those who play in that realm. Danger lurks everywhere
so we all need to be able to identify it early on. Some serious dangers are very hard to detect. Botulism
comes to mind here. High voltage on the other hand is a known danger and needs to be treated with
respect. I have several dead trees in proximity to a three phase power line. Even though I feel confidant
that I could fell them safely, It is in everyone's best interest to leave it to the power company. Eye protection
while using a grinder as well as inspecting the power cord is the prudent thing to do.
edit: Use grinding wheels rated for the RPM of the grinder is a good ideas as well.
some unsafe things in the past. Learning is mixed in too since a bad outcome will change behaviors.
Real dangerous stuff has the potential to cull out those who play in that realm. Danger lurks everywhere
so we all need to be able to identify it early on. Some serious dangers are very hard to detect. Botulism
comes to mind here. High voltage on the other hand is a known danger and needs to be treated with
respect. I have several dead trees in proximity to a three phase power line. Even though I feel confidant
that I could fell them safely, It is in everyone's best interest to leave it to the power company. Eye protection
while using a grinder as well as inspecting the power cord is the prudent thing to do.
edit: Use grinding wheels rated for the RPM of the grinder is a good ideas as well.
- Joined
- Nov 25, 2015
- Messages
- 9,988
that motor does not appear to have brushes, unless they are internal, so a speed control may not be appropriate.
Also, it appears to have a mark for REV erse... which may mean the housing head turns to change the timing.
This is actually useful if you have a threaded spindle. It will allow you to grind against the normal turn of the spindle.
Interesting, good luck...
Also, it appears to have a mark for REV erse... which may mean the housing head turns to change the timing.
This is actually useful if you have a threaded spindle. It will allow you to grind against the normal turn of the spindle.
Interesting, good luck...
I agree that the motor looks like an old router, I don't agree that the ratio is fixed at 1:1. Looks like the motor has three grooves and the spindle has two grooves. I am reasonably certain that at least some of the combinations are NOT safe with your grinding wheel, possibly none are safe. A grinding wheel exploding from over-speed or other misuse is a very dangerous event. Personally I would not use a wheel rated for less than 20,000 rpm on this set-up unless I could determine the actual speed it will turn. Even with a wheel rated for 20,000 rpm, I would not go above 1:1 ratio.
Hi den-den. It looks like only one combination is allowed due to the alignment of the step groove pulleys with the mounting plate. Using the drag of the spindle is dodgy. I will not use this thing without doing an rpm measurement. Another project, sigh . . . I mean, yay!
that makes sense, I had thought alignment could be changed with a simple spacer, perhaps not.
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