Thread: Bringing an old Robot back to life - Surface Grinder.

Hope you got a good deal on it??? What's the other item in the trailer???? Why did you have to unload it at night, was that so the other half couldn't see it
Kryn

That looks astonishingly similar to the Brown & Sharpe I'm rebuilding.... I'm amazed.
What are the specs for this one?

Kryn, the other machine in the trailer is a diesel injector grinder and it's base that I intend to turn into a small tool grinder. As for unloading the ROBOT at night, it just turned out that way after I got home and got all the lifting gear organised it was dark, before daylight saving time.

Yes Joe, very similar to the B & S, specs are the same.

Lex.

One of the first things I had to fix was the feed mechanism, you can see the two broken cast pieces in this picture.

http://i38.photobucket.com/albums/e1...psa3623d68.jpg

Here is the new lever and shaft assembly I made being reamed for taper pins.

http://i38.photobucket.com/albums/e1...g?t=1382095628

The feed mechanism with the new assembly fitted.

http://i38.photobucket.com/albums/e1...psc4f18dc8.jpg

With the longitudinal feed now working I started work on the crossfeed. A simple double ended pawl had one end broken off so I started work on a new one, I didn't think this little thing would require about 14hrs of solid work to complete.

This is the broken one.
http://i38.photobucket.com/albums/e1...ps9ee333dc.jpg

The new one in progress.
http://i38.photobucket.com/albums/e1...psfb7a2f95.jpg

Cutting the 3/8" square.
http://i38.photobucket.com/albums/e1...ps117f8128.jpg

Lex.

Nice work, but that is a bit of a painful shape to machine...i take it the 14 hours includes making the fly cutter....

With the images put the links between [IMG] and [/IMG] to get them to show up on the forum, or click the little insert image button (just above the ABC Button) and add the URL that way.

Cheers,
Ew

Thanks for the tip Ew, yes the time to make this included setup time and making tools etc, all part of the process.




Regards, Lex.

With the machine now up and running I have spent the last few days fitting an enclosure to house a VFD and converting the original motor to Delta configuration.



The Star connection point was very easy to locate.



Into the oven for about an hour to soften the varnish.



150 degrees C softens things nicely to allow easy removal.



Star Connection.

I made some good progress today and now have the machine running on the VFD. The motor conversion to Delta worked out well and it now starts better than it used to with the DOL starter

The 3 orange wires have been joined to the 3 wires at what was the star connection.


The repainted motor sitting on new mounts to allow better location.


VFD running at 50Hz and momentary push button controls.


Overall I am very happy with the Huanyang drive, it performs very well in a simple application like this and is quite easy to set up and use compared to other brands I have used.

Lex.

I like your nice restoration of the motor, likewise the VFD setup.
A few questions:
1. What type of tape or string did you use to bind up the stator windings after bringing out the star point?
2. Source of the VFD enclosure?
3. Can you give some details about the switch controls for your VFD setup (ie any e-stop etc)? I noticed that one photo seemed to show two indicator lamps (pushbutton switches?) on the outside of the enclosure, and a later view showed four.
Regards,
Bill

Bill, I used lacing tape similar to that in the first picture and then brushed on some special varnish made for motors shown in the second picture. This varnish requires a low temperature bake to dry it so it spent a couple of hours in the oven.





I got the enclosure through RS Components online with free delivery.
The push button switches are for the spindle stop/start and for an electric clutch that I will be fitting to allow the feed drive mechanism to be disengaged when not in use as it is a little noisy.
I may fit an E stop later on.

Regards, Lex.

Thanks, Lex,
Threads like this help to keep me plugging on with my own s-l-o-w projects.
Regards,
Bill

Originally Posted by Techo1

Bill, I used lacing tape similar to that in the first picture and then brushed on some special varnish made for motors shown in the second picture. This varnish requires a low temperature bake to dry it so it spent a couple of hours in the oven.

Snip

I got the enclosure through RS Components online with free delivery.
The push button switches are for the spindle stop/start and for an electric clutch that I will be fitting to allow the feed drive mechanism to be disengaged when not in use as it is a little noisy.
I may fit an E stop later on.

Regards, Lex.

Did you buy a length of the tape or the roll? Where did the varnish come from?

I have a 3ph 7.5hp motor 2 speed motor in my new lathe. I need to convert it to work with a 4kw Huanyang variable drive. I am planning on having a look at the motor soon. Maybe this weekend if I get the time. I will have a problem fitting it into an oven. We have a wood range and a small oven. The former will be too inaccurate and hard to control, the latter too small to fit this motor.

Dean