The third iteration.....is it time to build it yet?

rfrink

rfrink

Joined
Aug 1, 2000
Messages
863
Hello All,


Here is the latest grinder concept. The design was highly inspired by
the Bader III and by Robert Dockrell's photos and comments in the <a href="http://www.bladeforums.com/ubb/Forum51/HTML/001384.html" TARGET=_blank>second
iteration posting.</a>


The basic construction is steel flats bolted together.&nbsp; You can
nearly build it with a drill press and a saw....and maybe a welder..?
<center>


<img SRC="http://www.geocities.com/beaumontmetal/sq_wheel/rev3/NO4_CONT01.gif" NOSAVE BORDER=3 height=294 width=500>

&nbsp;


<img SRC="http://www.geocities.com/beaumontmetal/sq_wheel/rev3/NO4_CONT02.gif" NOSAVE BORDER=3 height=294 width=500></center>

It is shown here with a 10" contact wheel and a 6" driver wheel, however
I'll probably use a 4" driver wheel&nbsp; and an 8" contact wheel to start
with.


Here are more images:


<a href="http://www.geocities.com/beaumontmetal/sq_wheel/rev3/NO4_CONT03.gif" TARGET=_blank>Contact
Wheel setup (rendering)</a>http://www.geocities.com/beaumontmetal/sq_wheel/rev3/NO4_CONT03.gif


<a href="http://www.geocities.com/beaumontmetal/sq_wheel/rev3/square1.gif" TARGET=_blank>Square
wheel setup (views: left, front, right..etc)</a>http://www.geocities.com/beaumontmetal/sq_wheel/rev3/square1.gif


<a href="http://www.geocities.com/beaumontmetal/sq_wheel/rev3/cont01.gif" TARGET=_blank>Contact
wheel setup (views: left, right , front..etc)</a>http://www.geocities.com/beaumontmetal/sq_wheel/rev3/cont01.gif



http://www.geocities.com/beaumontmetal/sq_wheel/rev3/cont01.gif


I think it is time to build one and see how it runs.

I've run out of energy sitting here at the computer trying to figure
it out and would much rather be in the shop building it. It is easier for
me to workout the details in the shop rather than on the tube anyway.


I've got an idea for a speed control also.&nbsp; I learned that MTD
uses a infinately variable cone pulley system on a riding mower for speed
control. The dealer said that the pulley is about $65. Maybe with a few
brackets it can used....I'll let you know.

&nbsp;


Thank you again for all of the inspirational comments.


Sincerely,


Rob Frink

<a href="http://www.geocities.com/beaumontmetal/index.html">Beaumont
Metal Works</a>
 

Hi Rob are you going to put a rest on
it.The speed control I know what you are talking about,they also have them in
drillpresss
the system you are working on looks
like you have a winner there,I saw
roberet post his set up is nice and it cost him
only 350 for the whole set up,that sounds good to me. I have a knife he made me and he does fine
work and he did it on his homemade grinder
you should see the finish on the blade
it is Nice.
Get out there and make one of those babies
I will be up to buy one
All the best Nathan

 
Looks good, Rob. I assume the arm holding the contact wheel will slide to allow different size wheels. I'm up for another grinder to add to my Coote but it must offer small contact wheels for handle work.
Luck, Lynn
Add me to your contact list when you're ready to ship.
 
Yeah I like the 3rd one. That mtd pulley system requires 2 belts on it to work. Had 1 of the lawnmowers. The pully system is very touchy. I lost the top 2 speeds after 4 years. Using the mower 1-2 hours a week.I think with the shaft availble on the drive wheel a cone pully could be put on there.Then with a reverse cone on the motor you could have 3 or 4 different speeds.Like a drill press. I'LL try it.
I like the square wheel set up. Were you planning on offering a package.say all wheels and frame. If so what do you expect the cost to be/
Take Care
TJ
 
Gorege
check out the drawing in detail
there is a tracking adjustment
beside the spring arm next to the top idler wheel

 
Robert Dockrell,

I don't offer 4" or 10" rubberized wheels yet. I've been playing around with the idea and Nathan House has been kind enough to test them for me. I'm still experiementing and testing different rubber compounds and hardnesses. Maybe after a few more tryouts, I'll nail down the process.

Thank you for the photo's of your grinder!

<hr>

George,
You are right..the tracking mech isn't shown very clearly. I'll try to explain... the tension arm swings up and down to tension the belt, the idler pulley will be mounted on a second pivot such that it tilts in or out from the knob screwed in thru the back of the main tension arm. The same principle as the tracking on my bandsaws.

Tension will come from a compression spring (not shown) and I'll play around with the rate once everything is built.

<hr>

Nathan,

Yes, I'm planning on adjustable tool rest. I did'nt draw it up because I can make one easier than I can draw it. I want it to be adjustable up/down, in/out , and maybe pivot.

<hr>

Lynn,

Yes the arm is intended to slide in and out to take up most of the slack from wheel changeovers. Then simply clamp the arm in place by the lever screw on the left side and use the tensioner from there.

Ideally, you can have several arms ready to go ( small wheel, big wheel, square wheel, etc) and change them over with the flip of a lever.
<hr>

I ordered the steel today to build 2 machines. I'll pick it up tommorrow and get started....I can hardly wait! (today, my wife said the brakes on her car are grinding , ..so I may have a slight delay).

Maybe I can finish in a week or so.....college football on Saturdays doesn't help speed things up though.

Thanks again for the input, I've got a plan now and I'll report the results as they develope.

Sincerely,
Rob

[This message has been edited by rfrink (edited 09-11-2000).]
 
Howdy There rfrink.....!
I think that you have a very good design and I like it very much. As knowing a little about structural design, I like it. I would suggest that you make sure to use heavy enough materials for the frame for the strength and stability. Also make sure that you get your shafts and bearing strainght and true to prevent vibrations. I would also suggest that you make sure that pulleies and contact wheel and drive wheels are balanced. I really think that you ahve a good design, good luck with its construction. Let us know how it turns out.
"Possum"

------------------
Thomas Clegg
 
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