T-Slot dimensions
These rotary tables can be used for many kinds of heavy machining, and also for lighter duty applications such as laboratory, production part rotation, inspection, indexing to precise angles, laser marking, angular testing and measurements.
All 6, 8, 10, or 12 inch rotary tables are CNC ready-to-go systems, and include:
They can be used as a stand-alone unit with several modes to automate your rotation and indexing, or controlled by other CNC controllers for additional mult-axis sequences.
The Au86-118 motor has 400 half-steps per revolution, and the 450:1 gear ratio tables produce 180,000 steps per revolution. This gives a resoution of 0.002 degrees per half-step. Stepper motor top speed is over 8,000 half-steps/second, perhaps as high as 12,000 sps with lighter loads. With 450:1, this produces a table top speed of 2.7 rpm. If you need higher speed, then select the direct drive which is 90:1, and the table top speed is 12 rpm. Worm gear backlash is virtually zero and you can readily adjust backlash and tightness. Usually backlash is +-.001", and even this can be compensated for electronically in CNC programs to reduce backlash to zero.
Our?stepper motors and controllers give you great speed and torque, and many people have purchased these for automating various motions. Choose direct drive or?5:1 gear ratio, depending on your speed and resolution, which is +-.0020 to +-0.0100 degree/step.
Now this motorized rotary table includes our previous option for extra-precision, which gives you better rotating accuracy and tighter operation. The additional specifications, upgraded from our previous standard 6", 8", 10", or 12" rotary tables, are:
Faro Laser has purchased 26 of these extra-precision tables. They said it exceeds the accuracy and resolution they need for their laser pointing and measurements, which is one motor step makes the laser beam move at a distance of 250 feet.
Excitron offers you a very broad range of motor/controllers sizes from 1 oz-in to 4,600 oz-in of torque to fit your applications. Our controllers save you money, space, and time; yet give you robust intelligent motion control. They run "right out of the box" by typing a \'w\' then \'G\'.
Each Excitron motor controller includes all the electronics and drivers for running the stepper motor and adding intelligent motion to almost any device. There are no other electronic boxes and no messy cables. RS232 Serial port communication are built-in, USB or Wireless are optional. We also offer high-flex long-life data and signal shielded/jacketed cables for devices that rotate or translate.
You easily control how your stepper motor operates by using these modes, and the versatility of the input pins:
For further details, please see the Au_Controllercoder_Manual.pdf. You can combine many of these modes, with few restrictions. Hundreds of successful customers have created very ingenious motion using these simple "building blocks", some in as quickly as 10 minutes.
Most documents are available on our website. For serial communicating with any Excitron Controller, you need a dumb terminal serial program. No other software is needed. Look in Serial port programs link on homepage for serial port program choices to download. Hyperterminal comes with MS Windows. Please note that sometimes Hyperterminal will not communicate, so restarting it often helps.
You can easily setup the Excitron Au controllers for standalone (Motion Profile) mode and Input Profile Mode so that it performs exactly as you wish upon power-up. In this case, your computer is not needed. The Excitron Au controllers have many useful modes for inputs and output, so that you can add intelligent repetitive motion to almost any device. Connection with PLCs or Labview work well.
It is not so much about its massive reserve power, but more about the reduced heat generated and the reduced electrical noise. Top speed is also increased by 50% over our already strong existing controllers, and the torque is 5-10% higher with this controller since it runs so smoothly.
Reliability is increased because the 100 ampere rated controller is running at about 10% of design power. It can take a lot more abuse, too. If there were a contest out there, it would seem our new 100 amp controller would win it.
These integrated units are especially designed for industrial conditions, where dust, chips, and oil exist. All MRT rotary tables can work in the vertical position by using moly-lube.
Satisfied customer\'s statements:
Additional options for your project:
| Qty | Item | $ each | Category |
| 1 | AuSW4-2 --Switchbox for extra control and rotation | 79.00 | Accessories |
| 1 | PS-24-320W power supply | 129.00 | Power Supplies |
| 1 | PS-48-320W power supply | 139.00 | Power Supplies |
| 1 | Power strip, 6 outlets, protected | 7.95 | Power Supplies |
| 1 | USB-RS232 cable adaptor | 19.95 | Cables and Adaptors -- USB |
| 1 | Serial cable DB9 M-F 25\' | 9.95 | Cables and Adaptors ?- RS232 |
Our 24 volt 80 watt power supply is small and fully encapsulated, so it can mount close to the?motor without a shield. It is also possible to drive the stepper motor with the?power supply at full rated torque and speed, and be able to over-drive it almost 2 times rated torque.
With direct drive, where the motor is directly coupled to the worm gear, the gear ratio is 90:1. This unit produces the highest speed and lower torque compared to the 450:1 gear ratio. Each half-step of the stepper motor rotates the table 0.01 degrees, and it takes 36,000 half-steps for a full table rotation. Half-stepping improves resolution by a factor of two vs. full-stepping, and runs smoother. Some backlash exists, and is adjustable to less then .001". Repeatability is excellent due to the ground and polished worm gears.
When changing directions, the mechanical gears have a slight amount of backlash. Rotating in a vertical position is not a problem because we pack the rotary table with molylube. Axial and radial runout of the table top, and flatness, is less than +.0006".
Key specifications related to the main body of the rotary table, see drawings for tables not listed:
| Size | 6" | 8" | 8" HV | 10" | 12" |
| Table Diameter | 6.30 | 7.88 | 7.91 | 9.85 | 12.60 |
| # of Slots | 4 | 4 | 4 | 6 | 6 |
| Slot Width | 0.39 | 0.47 | .47 | 0.47 | 0.55 |
| T-Width | 0.67 | 0.85 | .81 | 0.82 | 1.01 |
| T-Depth | 0.39 | 0.370 | .37 | 0.37 | 0.45 |
| Square Nut Size | .312-16 | .312-16 | .312-16 | .312-16 | .500-13 |
| Locating?Hole Diameter | 0.984 | 1.111 | 1.160 | 0.930 | 1.570 |
| Length | 9.84 | 11.43 | 11.20 | 12.70 | 16.14 |
| Width | 7.88 | 9.30 | 9.55 | 11.30 | 14.17 |
| Thickness | 2.97 | 3.19 | 3.95 | 3.60 | 4.33 |
| Weight, lbs | 42 | 54 | 59 | 82 | 156 |
The RS232 serial port gives you easy access for changing parameters such as acceleration, SPS, and torque. Once setup for running in Input Profile MOde, Motion Profile standalone mode, or Driver mode (step/dir), the RS232 adaptor is no longer needed, if you prefer. As an example, it\'s easy to setup the controller to rotate to any angle you want, at the push of a button, and repeat up to 2,500 times, then delay an amount of time. With our new connector system, you can easily solder input wires for more control.
All of our power supplies are world-wide universal, and work fine at 110 or 230 Vac, 50/60 hz, and come with an AC power cord (except the 320 watt supplies have no cord). Our power strip has a convenient switch for ON/OFF, voltage protection MOV, and a power ON light/indicator. NEVER run any other cables, especially the AC cables, next to any signal cables. At least 6 inches must separate them, even if they are shielded. Closer than 6 inches can cause voltage spikes of more then 10 volts to appear on any data cable, and that can cause burnout of any electronics.
MRT Table/Gearbox Assembly Instructions
These instructions are for assembling the Au motor/controller/gearbox/worm gear to the rotary table base unit.? This applies for any MRT6, 8, 10, 12 rotary tables.? Excitron ships the MRT in 2 or 3 boxes to protect the precision parts, and some assembly is required.
There are two methods, and the first method is the simplest, and may be all you need.? Remove the plastic stop from the rotary table large opening, and insert the motor/worm gear subassembly into the large opening.? You will need to rotate slightly CW so that the worm gear is fully inserted into the table base.? When inserted fully, the blue gear box is nearly at the machined large opening.? Engage the worm gear into the large table gear by rotating the motor/gear subassembly CCW, and simultaneously shifting the large table top until no perceptible table movement occurs.
Lock the motor/gear subassembly with the short lever arm on top.? This firmly secures it from moving.? Plug in the power supply/RS232 cable into the middle 8 pin header position, and turn on the power supply.? Never plug/unplug this 8 pin housing with power ON.
Type a little ?w? to wake up the controller.? You are now going to rotate the stepper motor slightly to check the worm gear engagement.? We set the torque T value to less than full power, usually T=060 or 070.? Later you may increase this T value for higher torque.? Type ?G? to run the motor a short distance, noting worm gear engagement.? If you have too much play, then loosen the locking lever arm, and rotate the motor/worm gear subassembly CCW.? If you have too much engagement and the motor does not turn, then you could rotate the motor/worm gear subassembly CW.
The 2nd method follows from the 1st method, and involves setting the eccentric steel body hard stop so that you can engage/disengage the motor/worm gear subassembly without having to adjust the gear each time.? You will only need this method if you plan on free-wheeling the heavy table top often.
It is important that none of the two small screw sets, on the bottom face of the rotary table base, are allowed to fall inside the worm gear chamber.? If this happens, you will not be able to remove or adjust the worm gear backlash, unless you disassemble the rotary table from its large steel cast base (not explained here, but is fairly obvious to an experienced person).
1.?Remove red set screw from bottom of table.
2.?Remove worm gear position stop from behind red set screw.
3.?Loosen set screw holding worm gear retaining key in place.
4.?Pull out worm gear retaining key.
5.?Insert worm gear/gearbox into table, making sure eccentric collar lock is a quarter turn from being tight and clear of gearbox.
6.?Insert worm gear retaining key into table so that it slides into the key way on the eccentric collar, allowing the eccentric collar to rotate freely but not be removed from table.
7.?Tighten worm gear retaining key set screw.
8.?Insert worm gear position stop and set for desired level of worm gear backlash (optional).
9.?Tighten red set screw against worm gear position stop.
10.?Rotate worm gear against table to fully engage the gear set and lock the eccentric collar in position.
11.?Loosen both set screws on gearbox and rotate gearbox/motor to desired position.
12.?Tighten both set screws on gearbox to secure in position.
For further assistance, please feel free to call 720-384-3004 and ask for Kyle.
The oil reservoir in the rotary table is filled by moly-lube by Excitron. If you do not want this moly-lube, then use about a liter of one of these; you will need to purchase locally:
NEVER RUN THE STEPPER MOTOR IF THE TABLE ROTATION LOCKS ARE LOCKED!! The table rotation locks are the two long stem levers on the table-top side. The table-top locks are provided for locking the table top solidly, but only for some reason when you need a firm lock but not rotating the motor.
Any long length of power wire, of more then 12 inches, introduces a resistance drop, and inductance and capacitance that significantly and adversely affect the power supply\'s ability to regulate. The inductance and capacitance fools the power supply into measuring that the voltage is different then it actually is, because it introduces phase angle changes. This can cause wild oscillations; unfortunately the switching power supply usually makes the voltage go higher. This can destroy any electronics hooked up to it.
Wire resistance for 18 AWG stranded is .0065 ohms/foot, so with an 8-foot length, which is 16 feet including the ground wire, the resistance is .104 ohms. Any resistance over .02 ohms can cause huge problems. So even 16 AWG can be insufficient. Running multiple electronic devices off the same power supply just makes it worse. Lowing the Controller\'s "T", which lowers the amperage, is always a good idea to reduce electrical noise.
An additional problem of regulated power supplies is that they cannot tolerate a rapid change of current. This amount of current change is around 20% of the typical output, far below what is expected and specified by the power supply manufacturer. For instance, a 10 amp 24 volt power supply may oscillate with +-10 volt swings when only a 2 amp change occurs in 20 microseconds. One aggravating problem is that an over-voltage power supply protection circuit will actually cause the power supply to shut down. Almost all power supplies will shut down in 2-3 seconds, and then build the output current and voltage back up to 24 volts. Meanwhile, the load still exists, and hammers the power supply with even greater voltage fluctuations, with possible destruction of whatever is hooked to it.
A built-in wonderful self-protection comes from the automatic current limit of 5.5 amps, and thus no fuse is necessary. Adding a fuse increases resistance, which is not good. We purposely build our controllers so robust that they never burn out due to short circuit issues, but only when used with this marvelous 5.5 amp self-protection. The supplies are virtually burn-out proof, having only lost 2 out of 500 units, and that was only after hundreds of times of shorting the output because we use them for testing our motors.
Power supply manufacturers over-rate their units, and understate the regulation issues, so that they can sell against the competition. All of them are doing the same thing. I mentioned in 1979 I had severe noise and stepping problems until I physically moved the power supply to 4 feet from 8 feet, and used double wires of 14 AWG, and the steel chassis as ground. Had I known better, I never would have used a single supply.Over the last 4 years since we have been shipping this series of controllers, we have helped over 1,500 designers with power supply and motor selection. Some of these ended in dismal failure, and there is always a reason for failure. The largest failure is the power supply selection and long wires.
';