Something like that?With my Zeiss WL I can easily get 50nm steps with the Wemacro Micromate coupled to the fine focus knob.
https://www.ebay.de/itm/Carl-Zeiss-Mikr ... rk:28:pf:0
BR, ADi
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Something like that?With my Zeiss WL I can easily get 50nm steps with the Wemacro Micromate coupled to the fine focus knob.
That wasn't me. I was quoting mawyatt, just before explaining why I thought that was not the right number for you.Adalbert wrote:Hello Rik,Yes, I use this simple calculation :-)Using this simple relationship for DoF of lambda (green)/NA^2 (think this is right, at office now and don't have my notes) gives ~609nm.
BR, ADi
Yes, I think that the GFL focus block is similar to the WL/Universal I haveAdalbert wrote:Hello Pau,Something like that?With my Zeiss WL I can easily get 50nm steps with the Wemacro Micromate coupled to the fine focus knob.
https://www.ebay.de/itm/Carl-Zeiss-Mikr ... rk:28:pf:0
BR, ADi
I don't use a belt.Adalbert wrote:Hello Gene,
Could you please show your solution with the belt-mounting?
BR, ADi
Hi Gene,genera wrote:I don't use a belt.Adalbert wrote:Hello Gene,
Could you please show your solution with the belt-mounting?
BR, ADi
My vertical setup uses a Parker MX80 5:1 gear box inline with the motor, mounted on a McBain Z-Scope vertical stage with a 1mm pitch leadscrew. That's all mounted on a 18 x 18 x 2" granite plate isolated by Sorbothane bumpers. There's a Seiwa focus block (very similar to a Mitutoyo focus block and graduated in um) between the Mitutoyo FS-60 microscope and the Z-Scope stage. Without the gear box I get 0.4um travel/step with microsteps of 1/16 full step. I regret adding the gear box and will remove it at some point. If I ever need smaller steps it's a simple matter to add a motorized drive to the Seiwa focus block.
My setup doesn't have much in common with what you're describing but, if you think they'll be helpful, I can take some pics.
The motor voltage rating means that if you apply that much DC voltage to the stationary coils you should see the rated current flow. It has little to do with performance since most modern drivers operate at a much higher voltage and "current limit" based on settings that you've selected. You should be able to operate safely at any voltage that doesn't exceed the maximum rating of the driver. If you do operate at voltage greater than 12v you'll get a higher maximum speed (probably more than needed for stacking) and if the voltage is too low you may end up limiting the amount of torque the motor can produce. This is, in part, because you not only have to deliver the rated current but you also have to do it in a very short period of time.
Sure. The controller has a lot going on behind the scenes and the little I said probably could have been said better. In the end though I was just trying to present a simple example, in response to the question in the original post, in a simple way.mawyatt wrote:Hi Gene,genera wrote:I don't use a belt.Adalbert wrote:Hello Gene,
Could you please show your solution with the belt-mounting?
BR, ADi
My vertical setup uses a Parker MX80 5:1 gear box inline with the motor, mounted on a McBain Z-Scope vertical stage with a 1mm pitch leadscrew. That's all mounted on a 18 x 18 x 2" granite plate isolated by Sorbothane bumpers. There's a Seiwa focus block (very similar to a Mitutoyo focus block and graduated in um) between the Mitutoyo FS-60 microscope and the Z-Scope stage. Without the gear box I get 0.4um travel/step with microsteps of 1/16 full step. I regret adding the gear box and will remove it at some point. If I ever need smaller steps it's a simple matter to add a motorized drive to the Seiwa focus block.
My setup doesn't have much in common with what you're describing but, if you think they'll be helpful, I can take some pics.
The motor voltage rating means that if you apply that much DC voltage to the stationary coils you should see the rated current flow. It has little to do with performance since most modern drivers operate at a much higher voltage and "current limit" based on settings that you've selected. You should be able to operate safely at any voltage that doesn't exceed the maximum rating of the driver. If you do operate at voltage greater than 12v you'll get a higher maximum speed (probably more than needed for stacking) and if the period of time.
The controller behavior is a little more complicated than this I believe. There is the inductive voltage is too low you may end up limiting the amount of torque the motor can produce. This is, in part, because you not only have to deliver the rated current but you also have to do it in a very short Ldi/dt effect than must be accommodated by the controller and supply. With motors that have a small inductance you can get a rapid change in motor current that can change too fast for the controller to allow the proper motor current decay sequence in PWM current modes. With some older controller chips you had to set the timing of the decay sequences, with pin selection and sometimes with a resistor/capacitor changes for certain motors & supply voltages. Also, some older controllers have shown some misbehavior with certain motor/supply voltage combos (Ti chips are noted for misbehaving). I also recall someone having problems with higher supply voltages, well within the specification, but things settled down going to a lower voltage.
Another thing to watch out for is motor/controller overheating, this can even happen with small NEMA 11 motors (like the USA THK KR-15) because they have a higher voltage rating which translates to a higher internal resistance, thus higher motor internal I^2R heating. Having the ability to program the current limits under full software control has shown to be very valuable as one can tailor the motor current profile during operation and still retail the desired moving & holding torque.
The newer controllers seem to have a somewhat "automatic" mode which will hopefully eliminate or reduce the motor/supply problems seen with the older controllers, and recently I read where a controller that can sense the motor dynamic and static load situation and adjust the motor current accordingly.
Anyway, hope this helps some.
Best,
Adi,Adalbert wrote:Hello Gene,
Could you please show your solution with the belt-mounting?
Thanks Ray, but not really much craft. I drilled holes in three flat plates, the rest I bought.ray_parkhurst wrote:Beautifully crafted, rock solid system.
What do you use to drive the X, Y, Z motors?
Beautifully cobbled then!genera wrote:Thanks Ray, but not really much craft. I drilled holes in three flat plates, the rest I bought.ray_parkhurst wrote:Beautifully crafted, rock solid system.
What do you use to drive the X, Y, Z motors?
The drivers are Parker OEM350 with step and direction inputs and programmable micro-stepping.