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  #1  
Old 03-25-2020, 12:47 PM
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Default Harig Tru-dex

So a while ago I was looking for one of these, and ended up getting one from a dealer in the US.

These are used for dressing the wheels on a surface grinder. This particular unit can dress angles or radii, or sometimes a combination of the two.

When it arrived, I could tell it had been used lightly in it’s day, but not for quite some time. The actions/movement was very stiff and sticky. It wasn’t because of rust, rather it’s old oil etc that has gummed up and needs freshened up.

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  #2  
Old 03-25-2020, 12:53 PM
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Default Harig Tru-dex

So this morning was the time to give it some tlc.

The black knob attaches internally to a gear, which, through a rack, moves the diamond ‘sideways’ at the set angle. There’s a setscrew going to a flat that holds it on.

Next, the aluminum knob, has three set screws. Loosen all three, then it threads off. This knob pivots the diamond holder for doing radii. By adjusting it on the thread, it also sets the tension to the pivot function.

Down on the side of the housing is also a manual lock for angles, remove it as well.

At this point, the whole spindle assembly can slide out of the cast base.

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  #3  
Old 03-25-2020, 12:57 PM
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At the back of the spindle ‘head’ are three button head screws. These can come out. There is also a dowel to line things up that does show in the picture.

This allows the notched index plate to come off, and the shaft(s) and pinion to come out.

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  #4  
Old 03-25-2020, 12:58 PM
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Want some other stuff ?

appears to be getting out of the trade:
https://erie.craigslist.org/tls/d/er...095755401.html
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  #5  
Old 03-25-2020, 01:11 PM
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I used a little light spindle oil, and oil, clean, reoil as needed to clean and free things up. This picture shows how the oil turns black with the dirt and old oil, I think that was at round four or so.

There is a couple things in the housing that also need attention. Close side is an indexing pin, that uses the notches in the index plate to set for nominal angles. On the rear is a dowel, it can be slid ahead to engage the adjustable angle stops for the start and stop points when doing partial radii.

Both of these were stiff and sticky. There’s a set screw that engages a flat on the dowel, loosening/removing it allows the dowel to come out. (Forgot to grab a pic.)

The index pin has a little modified SHCS that rides in a slot in the pin. Removing it allows that to come out.

The index pin is a busy little assembly. It’s hollow, with a spring inside. In the end of the pin is a little blind rivet, which acts as a spring end or plunger. The pin also has a j or L shaped slot, which is where the modified SHCS fits into.

Reassembly of the index pin is a bit tricky. I ended up sliding the pin body in, and just engaging the slot with the tip of the cap screw.

Then I added the spring and rivet, and pushed them in past the tip of the shcs. While holding that in place with a small hex key, I tightened the SHCS to trap the spring and rivet under it.

Then just thread the knob back onto the pin.

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  #6  
Old 03-25-2020, 01:22 PM
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Reassembling the ‘head’, I cleaned everything up. The two dovetailed pieces go together, and I adjusted the gib so I had a nice slide fit with the two parts.

The pinion has to go in a certain orientation. There’s a tang on the end, that with the pressure of the sping on the shaft, pops into a slot inside the head. This locks the side to side movement, unless the black knob is pulled back in operation.

With the head and shaft/spindle re-assembled, some oil and it is ready to go back into the housing.

Re-install the knobs, adjusting for function as I go, then the diamond holder and a new diamond out of my toolbox inventory, and ready to go.

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  #7  
Old 03-25-2020, 07:02 PM
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It's been about 55 years since I last saw one of those. I don't particularly want to use one again.
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  #8  
Old 03-25-2020, 07:11 PM
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It should be functional now. Sounds like a good tool to have, if you have a need.


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  #9  
Old 03-25-2020, 08:24 PM
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Quote:
Originally Posted by toprecycler View Post
It should be functional now. Sounds like a good tool to have, if you have a need.


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Where I wanted one like this is for what I was taught as ‘side wheeling’. By dressing the side of the wheel at a slight angle, maybe 2 degrees in from vertical, it creates a slight cup. Now the side of the wheel will cut. Done correctly it’s now possible to grind slots, faces etc.

The bonus of this one is now I can also dress any radii that I may need.


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