Disc/Belt sander speed control?

Gallery, Projects and General > How do I??

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MetalMuncher:
Thank you Baron.

As it turns out, using the sander at its default speed has not been a problem, as I had thought it might. So things have been working well. I have the Y axis strip finished, and am almost finished with the X axis first side.

One thing I learned along the way is that trying to apply pressure to make the material removal more aggressive does indeed tend to round the edges. But avoiding that, holding the strip with minimal pressure downward, just enough to keep the surface flat on the sander and letting it do the work, is working very well. I place the strip on the belt parallel to the long axis, with an end against the work stop. Start the sander while holding the strip lightly. Stop the sander before moving the strip. This prevents roll tendency. And a precision straight edge held across the surface, looking into a bright light, verifies the surface is remaining flat. The rest is just rinse and repeat and time spent. I use 600 grit to remove the manufacturing grinder marks from the strip surface. Then 1200 grit to remove the remaining marks, finishing with 2000 grit for a nice shine.

MetalMuncher:
All finished, and the new gib strips are installed. Working very smoothly. :)

Jonny:

--- Quote from: MetalMuncher on April 24, 2014, 10:56:35 AM ---
Although I can work a file well, I would consider it the least likely to end up with a flat finish, especially on something only 1/2 wide, since only muscle control is all that keeps it anywhere near level.
--- End quote ---

I would love to see the 'flat edge', Drop a straight edge on it I'll be impressed.

In proper English theyre descriptive terms used when filing, every file will have a belly none are perfectly flat. You cant file flat with a flat file it will be doing the same thing as the linisher creating a radius!
You can file several square feet to microns should you wish its also a lot more accurate than scraping.
Filing you have to look at what your doing and react accordingly.

Three square is the proper name for a triangular file.
Just had a look on youtube, there is nothing on there for creating a flat surface accurately. Shame this deserves a thread of its own.

DaveH:
I think there are many right ways to do the job right. :thumbup:
:beer:
DaveH

Fergus OMore:

--- Quote from: DaveH on April 25, 2014, 02:39:20 PM ---I think there are many right ways to do the job right. :thumbup:
:beer:
DaveH

--- End quote ---

No, not really! All the right ways follow a strict pattern of procedure.
At the end of the day or at the beginning, you have the famous three plates- or someone has that become the classic references to flatness. Your follow Euclid and Pythagoras in the concept of lines which are parallel - and these concepts of the Triangle and the Square are empirical and axiomatic.

At while ago, I was sitting as a new boy on the block and there was the classic Squaw on the Hippotamus being equal the sons of the Squaws on the other two hides. I looked at my companion and said 'Bloody Hell. do I have to try and prove it?'

That, whether others may differ is what you have to know and retain. The rest of the problem is surprising easy

Quo erat Demonstrandum

Norman

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