Another Tool & Cutter Grinder

wrmiller said:

No lube or handwheel?!? I think you're being a bit too hard on yourself Mark.

Given what I've seen of your previous work, I suspect it will work just fine once you have it all completed.

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Yea....... you probably right ........but that is how I keep the quality

I like the way you did the shaft to be able to use the pump motor. I have a small problem with that, all my stones are 1/2" or smaller hole in them. I love the design and bring it all together it will be great.
Keep it coming.

NEL957 said:

I like the way you did the shaft to be able to use the pump motor. I have a small problem with that, all my stones are 1/2" or smaller hole in them. I love the design and bring it all together it will be great.
Keep it coming.

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That is not really a problem , Nelson. That pump motor shaft is 12 mm diameter. It would be easy to make an adapter that would use stones with a .500" hole. I can draw you one if you need it.

Mark
I open to any suggestion you have. I know 12 mm = 0.472 that does not leave much material. But like I say I'm open.
Thanks
Nelson Collar

NEL957 said:

Mark
I open to any suggestion you have. I know 12 mm = 0.472 that does not leave much material. But like I say I'm open.
Thanks
Nelson Collar

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Nelson, If you build a direct drive grinder like I am doing, I will make you the adapter......How about that, my friend.

I discovered a little design problem with my grinder today.... but no worries as I also came up with a solution and it just gives me a little more versatility.

This is a basic concept drawing of the grinder.Everything is fine in this view.




This is a concept view of the grinder after spindle inversion to have the wheel perpendicular to the table instead of parallel to the table.( The spindle inversion is super easy and simple on this grinder , unlike the Quorn or Bonelle.) The problem is the wheel is way over the table and does not leave enough room for using the air bearing in this mode. To remedy this, I will make the column assembly sit between two small rails on the base and by loosening a clamp, the column will slide parallel to the table allowing the wheel to be placed in any location, I wish, in a 4 inch travel range. This problem was kind of a blessing because the fix is simple. and it will give much greater versatility to the grinder. I'm off to the metal store to get some stuff to make the fix with.

Another problem found ...and solved.... was the micrometer stylus I made to set the height for grinding flutes was way too big to fit over the table. The design was OK for the Bonelle as there was no table under the stylus area. So...... I knocked it apart and cut it down so it will work on my new grinder
This is the stylus before I cut it down. The bottom end is about 2 inches long and there is .500 inches of travel on the micrometer. each mark on this micrometer is .001". it is easy to approximate a 1/4 thousandth setting on it with reasonable accuracy ( even though that accuracy is not required).

You can see in this photo, the micrometer is cut down to 1 inch long and will fit nicely on the new grinder setup. I still have .400" of travel. ( the stylus is too long right now. It will get cut shorter once the air bearing is mounted to the table and the length can be determined. The stylus will be .200" above center at "0" , allowing plenty of adjustment in either direction.

I have ordered a new plate for the base, metal for the column mount, and a plate to make a 1/2 riser adapter to make the air bearing fit this table. It should be here this weekend. I also went to the store and bought some aluminum bar to make the rails so the column mount will be movable.

I also made a half dozen "T" nuts for the table to hold the accessories in place.

mark_f said:

Nelson, If you build a direct drive grinder like I am doing, I will make you the adapter......How about that, my friend.

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Mark
That is too much and yes it will follow your build.
Thank you so much, I'm speechless
Nelson Collar

Mark
With your micrometer stylus, do you think it might work taken off the airbearing and mounting it to the table with the adjustments on the front side.
Just an idea.

NEL957 said:

Mark
That is too much and yes it will follow your build.
Thank you so much, I'm speechless
Nelson Collar

Mark
With your micrometer stylus, do you think it might work taken off the airbearing and mounting it to the table with the adjustments on the front side.
Just an idea.

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No, that won't work. It has to be mounted on the front of the air bearing because the air bearing tilts away from the wheel under spring tension and tilts back in to a solid stop and the stylus has to be mounted to follow the tool being ground. The tilting feature is so you can tilt away from the wheel to position the spindle, grind , turn to the next flute, tilt away to position, tilt in again to grind. This is a great feature of most air bearings because you start your grind from the shank end and grind towards the tip. Clear as mud .... right?



Nelson, Let me know when you start to build.... I'll help all I can.

Crystal. Thank you

NEL957 said:

Crystal. Thank you

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You know.......... I don't see why you couldn't do that, because the Quorn and Bonelle are set up that way. Although I never tried to grind flutes on the Bonelle, but it tilted also ( not under tension) and you would have to land on the finger and hit the wheel at the same time. I don't know how well that works. Unless you were going to grind backwards and start at the tip which is wrong from everything I ever knew. It has been at least 35 years since I used an end mill grinder and I can't remember anything about it.