My Troyke CNC rotary table is actually working!

Ignoramus32079 · 2010-08-02T05:44:21+00:00

A while ago I mentioned this Troyke CNC rotary table that I bought offebay. was described as "untested, as is", so I called the seller andspoke on the phone. My impression from him was that he was an honestperson, so I bought this table despite it being AS IS. When I received it and applied power to the motor (30v, no more than5A limited power supply) it would not budge. Called Troyke, they haveNOTHING on it.I set it aside and continued to work on my CNC mill.Now that I have only a few odds and ends to do on the mill, likebuttons and switches. They are complicated due to HALUI etc, so Iwanted to do soemthing easy. I looked at the table again.I took the motor off. Without the table, the motor spun happily. I stuck a bar into the table's motor connection (star type plasticforce transmitter thingy) and tried to turn the table. After a littleeffort with a wrench, it moved. I found one more screw that might (notsure) have stopped the table, backed it out, and in any case, after alittle while of rocking around the table felt much easier to move. Itmight have sat for 10 years or whatever and just got all stuck. Put the motor back and again, the motor would not move it. At thispoint I realized that 5A is just not enough to get it going. I called in in heavy artillery (military battery charger going up to20A, 150V). Set it to 30 volts. When connected to that, the motorMOVED, and kept going. More voltage, more speed. I kept it running for a while (20 minutes orso). The running amps were approximately 3 amps. From that, the motorbecame warm, but barely, had a body level temperature. I explain this by assuming that the screw is preloaded or some such,and is hard to turn because Troyke tried to eliminate backlash. What I know at this point is that it is a DC servo driven table and itworks. What I do not know is what is the operating voltage of this table. Howwould I find out? I am thinking, to take the motor out again (or takethe rear encoder cover), and increase voltage until I...

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Gunner Asch 16 years ago

Its the "almost instantanious" part that you should be concerned about.

It might be nice and tight at the moment...but if you use it a lot...it wont be so tight in the future. Best do it right, and never worry about it in years to come.

Gunner

"A conservative who doesn't believe? in God simply doesn't pray; a godless liberal wants no one to pray. A conservative who doesn't like guns doesn't buy one; a liberal gun-hater wants to disarm us all. A gay conservative has sex his own way; a gay liberal requires us all to watch and accept his perversion and have it taught to children. A conservative who is offended by a radio show changes the station; an offended liberal wants it banned, prosecuted and persecuted." Bobby XD9

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Ignoramus18921 16 years ago

All good points.

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Ignoramus18921 16 years ago

You can be sure that I will not use it a lot.

The ramp (hump) on the side will look like this:

__.,----,.___

so the table will have plenty of room to stop.

Running fast into a home switch has many advantages, related to prevention of bouncing. I remember that homing too slowly, for my X axis, led to home switch bouncing and confusing EMC. I upped the homing rate and I am good now. I hope at one inch per second on all axes simultaneously.

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Pete C. 16 years ago

Aint' ASCII art fun?

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Ignoramus18921 16 years ago

Yep.

I had a great ASCII art collection but lost it accidentally.

I will do pretty much as you say with the ramp. i

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Gunner Asch 16 years ago

Blink blink....blink....right.

"A conservative who doesn't believe? in God simply doesn't pray; a godless liberal wants no one to pray. A conservative who doesn't like guns doesn't buy one; a liberal gun-hater wants to disarm us all. A gay conservative has sex his own way; a gay liberal requires us all to watch and accept his perversion and have it taught to children. A conservative who is offended by a radio show changes the station; an offended liberal wants it banned, prosecuted and persecuted." Bobby XD9

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dan 16 years ago

What's that Lassie? You say that Pete C. fell down the old rec.crafts.metalworking mine and will die if we don't mount a rescue by Mon, 02 Aug 2010 11:01:51 -0500:

Another example: Milling a spiral groove, such as used in a scroll chuck.

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Ignoramus18921 16 years ago

that does not require a rotary table.

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Lloyd E. Sponenburgh 16 years ago

Ignoramus18921 fired this volley in news:9LidnRyx7tVY7MrRnZ2dnUVZ snipped-for-privacy@giganews.com:

Ig, to do it to the precision necessary (including surface finish) to be an acceptable scroll, it does.

Yes, you can program a scroll in G-code, but of all the things I can think of that require a good finish, chuck scrolls are right up there. Minor interpolation errors would create a "grabby" finish.

Scrolls are (were?) usually machined with mechanical devices, with gearing to establish the spiral pitch.

LLoyd

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Ignoramus18921 16 years ago

After some thinking, I think that you are right.

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Karl Townsend 16 years ago

Wrong CNC machine. Use a CNC lathe for a perfect scroll. Just like threading.

Karl

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dan 16 years ago

What's that Lassie? You say that Ignoramus18921 fell down the old rec.crafts.metalworking mine and will die if we don't mount a rescue by Mon, 02 Aug 2010 20:32:53 -0500:

Your right.

how about a cam groove in the OD of a cylinder.

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