Home Built Surface Grinder

[Hubert S.]

The wavy surface might be partly due to slight eccentricity in your contact wheel. I trued up my contact wheel using a flat piece of steel with some sandpaper attached with spray glue. I posted a thread about it here:

Truing up an SGA contact wheel

I just built a surface grinding attachment and noticed some slight waviness in the surface finish of the test pieces I ground. The amplitude of the waves is very small and barely makes the needle on my test indicator move, but it is pretty visible by eye, even though it is very difficult to...

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[jeness]

Thanks! Looks like a good starting point to address the waves in the finish.

 

[Ken H>]

As I'm sure you're aware using a firm wheel helps, perhaps even an aluminum wheel that's precision turned. Also shallow passes for finish work, perhaps only .002" or so deep. You should be able to get <.001" over the 150mm lenigth. Here is one of my best results showing what it can do;

Darn, those images are larger than planned. AND do remember, this is about the best I've done - usually more like .001" to .002" over that 10" length

 

[J. Keeton]

I've had issues with loosness in that table slide. I ended up wedging in some 0.010'' shims to tighten everything up... not ideal, but it got the job done.

I hope someone finds a better option for this cross table one day. I was even thinking of buying a cheap mill vise and modifying it.

 

[Natlek]

Thanks! Looks like a good starting point to address the waves in the finish.

If you don t want waves in the finish , get real surface grinder .Very light pass at finishing will help a lot .Slow moving chuck also would help , but you will see them there whatever you do ......problem is that belt is not endless ,it is glued at the ends

 

[Hubert S.]

I hope someone finds a better option for this cross table one day. I was even thinking of buying a cheap mill vise and modifying it.

I made my own dovetail slide with adjustable gib screws on the mini mill, see link below. There are other DIY solutions that are a bit easier/quicker to machine documented in this thread, and I think K Ken H> posted his version in a separate thread as well, but it's been a minute since I looked at all of this.

Surface grinding attachment WIP

I started building a surface grinding attachment and thought I would document my progress as I go along. This build is likely going to take a little while, as I have not really made a plan or ordered any components other than the linear rail. My first step was to make the chuck. I am not sure...

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