Thread: Help me finding Gear ratio of DCI 6R45 Rotary indexer.

1. Help me finding Gear ratio of DCI 6R45 Rotary indexer.

Recently i purchased DCI 6R45 turntable from the salvaged workshop... Its made up of solid Aluminum with limit switches and optical sensors..

I do not know about the gearing ratio..how can i find? Anybody with literature?

2. Today i worked on the turntable and it tooks 720 steps for covering 45 degree of travel...
Now my controller run in 1/2 step mode and the stepper motor is 1.8 degree/step. can you tell me what will be the gear ratio?

is my following Math is correct:
45 degree= 720 steps
1 degree= 720/45= 16 steps
360 degree= 16 x 360 steps= 5760 steps
200 x 2 x Z= 5760 ' where Z= turntable gear ratio, 2= half step mode and 200= No. of steps/360 deg of stepper Motor
Z=5760/400
Z=14.4???

Can you tell me what gear ratio of my Gear Box?

3. In half step the motor should be 400p/rev which comes out to a G.B. ratio of 14.4:1.
It is usually simple to check by manually counting the turns required of the input shaft for one revolution of the table.
Al.

4. Hi Al,
thanks for verifying... The gear ratio seems to be odd for such a reputable company but what can we say ...
Actually their are two things i could not find the gear ratio manually:
1- The motor is fitted with zero-backlash helical coupling and after removing the motor and coupling the worm shaft is very inside the bore, difficult to reach..
2- I am lazy

I am using Programmable arduino for this turntable.. This turntable is the part of my laser scanning setup and i not use computer to control the turntable and laser/motor...

Thanks

5. With a table intended to be motorized the precise ratio is not all that important as it can usually be scaled, with the manual type the ratio is normally geared at a precise ratio that translates exactly to match the handwheel graduations.
Al.

6. I have found quite good gear ratio calculator at this page and it looks really nice

Gear Calculator - Cargister

7. Does it only contain a single worm wheel and pinion? If so the ratio must be an integer (a whole number).

Also, 14.4:1 sounds quite low for a worm drive. Normally the worm wheel will have at least 25 to 50 teeth (25:1 to 50:1).