Small victory in the war against the Cincinnati cinturn 12u

spun the spindle today for the first time woooot. took forever to find a compatible drive that wasn't DOA. Motor control is fine enough to position as a C axis. Win. Now onto the tunning aspect and setting up a voltage divider for the Tach input. 7 vs 29v. Unless someone has a bolt on reliance 7v/1000rpm tach for a 30hp frame DC motor laying about.     youtube.com/shorts/DtmRaCk3tw4?feature=share     youtube.com/shorts/ozQ5y4O94hY?feature=share

I got a 0-1000ohm pot and a 500ohm R1 is 500ohm and r2 should be 360ohm roughly. I got a ridiculous 100w pot and a 20w resistor. I am sure the output of the tach is in mw, but it's a good spot for overkill. I like being able to use the pot to fine tune the speed. I have to call glentek tomrow and go over my jumper setting and start connecting stuff to my IO card. By the weekend I should be able to do the basics, next up after that, getting the turret to work 

do you have a diagram of how to do that with just the POT ? I am assuming straddle the 2 conductors and then decrease resistance until the appropriate bleed occurs ? It was just the POT they had in inventory that was industrial and sealed etc with the range of 0-1000ohm. my EE skills are very rusty and mostly just diagnostic in nature. 

I think I know the ratio, LOL. as with everything with this god damn machine, you never can be sure of anything. ROLFMAO. I am going to hook up the hydraulic power unit this week. I could definitely use some help configuring for the 7i97 and 7i77d. I'll have a pinout by friday. I am more than happy to pay someone to help me get the tail stock, chip conveyor, turret running. 

On another note, I have a hydrualic chuck obviously. I would like a foot control to overide to open it. What's the best way to setup the chuck, a NC relay to keep it closed when the machine is powered and a overide to open it ? 

andypugh post=253466 userid=723Tacho output to the two ends of the pot track, and then the wiper and one end to the drive.

I just tried this with a variable power supply, a pot and a multimeter and it seemed to work.

Though, as you know the required divider ratio, I don't see any reason not to use fixed resistors.

  I did some testing today and it looks as if I have motor control in the 5-10 rpm range from 5 rpm to 1800 rpm. Runs a little slower than it would have with the reliance drive, but this drive has more current. I will do a pulley ratio change to get the spindle speeds where they need to be once I get the hydraulic hooked up and I can test the gear box ratios. Wound up with a 470ohm on R1 and a 160ohm on R2 and a quick gain adjustment and hit 6.95v per 1000rpm. 

Appreciate the help so far. 

Can you scale the tach input to what you have? Many drives use either a pot or thru hole resistors to allow the use of different voltages.

​​​​​​I have several tachs, some 3v and I have one that is 30 or 36 v . None are gonna be bolt on, if they can be of use, pm me.

the voltage divider is super simple, and it's working great. I just finished the basic analog tuning of the servo drives on the X and Z axis servos today, these Glentek drives are SWEET once you understand how they work. I cannot imaging how fast this machine would move at 2000rpm top speed for these motors, at 50 rpm this thing is moving fast, and it's a big machine to see move fast lol.

Will be ready to start configuring the 7i97 this week, hopefully I can manage it.