New To CNC

[ShawnM]

Do you have then set up as home or limit switches. You only need 3 switches, one for each axis set up as a "home" switch and then you can set the software limits for max travel. No switches needed at the far end of travel if you don't want to install them.

If you would post a current report we can see how you have the machine set up and offer better answers.

[OceanFab]

Hi, on https://www.centroidcnc.com/dealersuppo ... 954.r5.PDF it shows the Com line connected to Gnd.
Is that right?
Also, I have open limit switches so will connect them in parallel, but I am using Openbuilds 3-wire switches, can you give me a hint?
Thanks

[ShawnM]

Hi, on https://www.centroidcnc.com/dealersuppo ... 954.r5.PDF it shows the Com line connected to Gnd.
Is that right?
Also, I have open limit switches so will connect them in parallel, but I am using Openbuilds 3-wire switches, can you give me a hint?
Thanks

Please start your own topic so as not to hijack someone else's topic. In your topic post a pic or wiring diagram of your sensor or reach out to openbuilds. The link you posted does not work.

[KyleProvancher]

Are my overall turn ration suppose to be this precise? They measure correctly.

How do i set in/min vs rev/min? I guess what are a good setting for everything at and below my blue mark?

[centroid467]

Yep, your turns ratios should end up being to as many decimal places as you can get them. The procedure in TB 36 shows how to get an accurately measured value after the rough determination. It is a little odd that you have the same values for both X and Y.

in/min vs degree/minute should just be linear axis vs rotary setting. I am not sure where the rev/minute comes into play with Acorn but if it is possible to set a rotary axis to be commanded by revolutions then it would make sense.

[KyleProvancher]

I am using the same motor and screw drive. Should they be different?

[centroid467]

They usually end up being a little bit different even with identical nominal screw pitch and so on.

[ShawnM]

I agree, there's no way they will both be exactly the same. I see this over and over in reports and it's practically impossible for the turns ratio to be the same for any two axis. Even with identical components. Keep doing the fine DRO procedure until it's repeatable several times in a row. Carry the decimal out as far as you can and it'll only get more accurate. For router guys this amount of precision may be enough.

For the max rate, no two machines will be the same. You can mathematically calculate your max rate but that doesn't always mean the machine will do it. There are several factors that will play into setting a good max rate. Your comfort level first and foremost. Motors/drives, gear train, size of the machine, ball screws versus rack and pinion, is it a steel frame or one of those extruded aluminum frames?

[KyleProvancher]

I have a 1515 went 40" Y and it was less than a 1/16 off. But I will definitely test this again.

Here is my rig.

[ShawnM]

I have a 1515 went 40" Y and it was less than a 1/16 off. But I will definitely test this again.

Here is my rig.

That's A LOT and it tells us that the turns ratio is not quite correct. Are you doing the DRO tuning with gage blocks and dial caliper or just a tape measure/ruler? Each axis can take about 30 minutes or so if you really want to dial it in.