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Hello Imre, This is the code which I used. Hope it is useful to you. Regards Colin /* 4x4 matrix keypad amd a 20 x 4 LCD. Edit StepsPerRotation & TableRatio(# of turns for 360 degrees)in line 29 A4988 Stepstick/Pololu driver 5/2/2015 */ #include <Wire.h> #include <LiquidCrystal_I2C.h>...

Thanks everyone for yor help. I finally stumbled on a way to correct the innaccuracy. This was by trial and lots of error. I tweaked the table ratio in the sketch by about+0 .15, and changed the Ints to float for the ratio and multiplier. I fastened a digital protractor to the faceplate of the...

Regards Colin.

Thank you all for your suggestions. I will try them out next time I am in my man cave. Limited time at the moment. I will post the results when I have investigated. Thanks once again for your help, best wishes, Colin

Thank tou Andrew for your reply. The setup is exactly as bmac2 describes in the article Rotary indexer for Dummies on this website. I have followed the instruction, as i am not arduino savvy. The arduino sketch is towards the end of the article. Apart from altering the gear ratio, ( 40/1 worm...

Thank you for your comments. I have checked the wiring, all good, and tried a different stepper motor. The results were exactly the same, a 3 degree shortfall in 360 degrees. I feel it must be an error in the Arduino sketch somewhere, but I don't have the expertise to find it.

Thank you for your prompt reply, The stepper motor is controlled by the Arduino sketch, provided by bmac2 in Rotary table indexer for dummies. I have absolutely no idea about Arduino sketches, i.e. a dummy. I followed the instructions by numbers, and it does work, but not accurately. I have...

I have recently completed the Arduino indexer for dummies . When I use it to do 360 degrees it is about 2 to 3 degrees short and this is cumulative. My dividing head has a 40/1 worm drive and the stepper motor has 400 steps per. revolution. Is there any way of tweaking the software to make 360...