New Rebuild on Sherline Chucker Lathe & New build on 5400 mill

[martyscncgarage]

run out of the probe must be mechanical adjusted.

Use a lever type indicator like this:

https://www.girodinstruments.ch/en/product/gt-1452-r/

Uwe

That’s what I have. Did u find any additional documentation for the probes we are using from Ali Express regarding adjusting the run out? All I have is from the web page and there is nothing on how to to it.

Did you loosen all grub screws 1st OR just tighten the one on the high or low side? They seam really tight with little effect on adjustment

Sure would be helpful if you would post a link to the probe and or its manual....given a Chinese import, sounds like no much.
Pictures of the probe would help.....
You need a ring gauge to calibrate the probe one it is concentric with the spindle

For example, here is the manual for the KP-3: https://www.centroidcnc.com/centroid_di ... _probe.pdf
With probes you usually get what you pay for.....
Marty

[suntravel]

To adjust the runout of e probe tip, no ring gauge is needed, this is done with a dial indicator and setting the adjustment screws.

The Chinese probe Bill uses, is adjusted like the KP-3 or a Haimer.

Uwe

[Upnorth]

Hey all, On my Tormach there is a calibration procedure to adjust probe tip runout. Basically probing a fixed surface and making adjustments in Path Pilot control and adjusting the set screws on the side of the probe to dial it in.
I’m assuming this is pretty standard for VMCs and knees mills to dial in a probe.

Is there a similar calibration method for CNC12 to dial in the probe tip for mill by using the probe to probe a surface and make adjustments in the control and or give you a sense of how much to adjust the set scores on the probe? OR do we only rely on mechanical adjustment on the probes set screws via test indicator?

OR is the only method to use test indicator on the tip of the probe? I have tested doing this on my lathe probe and its pretty tricky to get the right amount of preload on the indicator without influencing the probe tip. I have a disk end on the lathe probe so will be much easier than the mill probe with a 2mm ball. The slightest preload has some degree of effect on the probe end no matter how little preload. Are seams really counterproductive and uncertain because the probe spring is fitting the indicator arm? ?

Now I’m sure it doesn’t help that I only have 30.00 Amazon indicators. I’m sure a higher-end one would be better but that’s what I have for now.

Any input welcome on this.

There are two steps to calibrate a probe. Step one is to adjust the runout of the ball at the end. I did this with a "last word" type of indicator. The one I used has a needle with little side force compared to the spring force of the probe so there is no deflection. This is a relative type of measurement so even cheap indicators work. A normal dial indicator has a stiffer movement than a last word type. Also the last word type has a finer scale so small movements seem huge. Adjust tip runout to zero using the screw adjusters on the probe.

The second step is to calibrate the diameter of the probe. This is done by using the probe to measure the diameter of a known bore. The effective diameter of the probe is obtained by subtracting the measured probe difference between actual bore diameter and measured bore diameter from the diameter at the tip of the probe. I'm not sure I explained the second step right but it's pretty clear in the manual.

[suntravel]

On the lathe you do not need to calibrate probe dia.

1.) adjust runout
2.) Part Setup : Set X Part 0/Position with Skim cut Tool 1
3.) Tool Offset : X Diam Auto
4.) Z Ref Auto
5.) Measure offset Z and X Auto
6.) repeat 5.) for the other tools except drills and taps

Uwe

[martyscncgarage]

To adjust the runout of e probe tip, no ring gauge is needed, this is done with a dial indicator and setting the adjustment screws.

The Chinese probe Bill uses, is adjusted like the KP-3 or a Haimer.

Uwe

You are correct.
Bill does not show us his import probe. So we can't make a suggestion at to how to adjust our the run out.
The ring Gage is used for calibration of the probe in CNC12
Marty

[BillB]

run out of the probe must be mechanical adjusted.

Use a lever type indicator like this:

https://www.girodinstruments.ch/en/product/gt-1452-r/

Uwe

That’s what I have. Did u find any additional documentation for the probes we are using from Ali Express regarding adjusting the run out? All I have is from the web page and there is nothing on how to to it.

Did you loosen all grub screws 1st OR just tighten the one on the high or low side? They seam really tight with little effect on adjustment

Sure would be helpful if you would post a link to the probe and or its manual....given a Chinese import, sounds like no much.
Pictures of the probe would help.....
You need a ring gauge to calibrate the probe one it is concentric with the spindle

For example, here is the manual for the KP-3: https://www.centroidcnc.com/centroid_di ... _probe.pdf
With probes you usually get what you pay for.....
Marty

Go back to page 10 Here in this thread I did post all the documentation I have on it.

[BillB]

Hey all, Anyone have knowledge of dialing in a KBSI 240D signal isolator board with a DC speed control and DC motor for correct RPM output? This is the Sherline’s solution to spindle speed control for Acron. FYI: The KBIC SCR in my build is the original OEM manual speed control that the machine comes with.

Had a friend from work help me all day yesterday to try and dial in the RPM output as my efforts yielded the same results. He is a skilled micro electronics and micro processor programmer guy. We spent all day on it. We have adjusted output to 10 volts. Watched one of Marty’s videos on the spindle bench test. We have the min pot set to 0 volts the max pot set to 10 volts (Sherline recommends 5-8 volts) but we we were getting less RPM at 8V so we decided to go up to 10 as per Marty, Acron & OEM instructions. The output at the the spindle is way off. When I command 2800 RPM (max RPMs as per Sherline is 2800 for these machines) in MDI I am getting approx 2800 range of rpm’s 9.2 volts at the spindle and encoder within a acceptable tolerance give or take 10 RPMs. The lower the RPM I enter into MDI at the spindle/encoder the lower the drop off percentage is at the spindle. if I enter 2500 I get 2305 at spindle and 7.2 volts. If I enter 2000 I get about 1470 at the spindle and 5.1 volts, If I enter 1500 RPM I get about 640 at the spindle 2.5 volts. Will not even spin up when 1000 RMP .6 volts is entered. We understand the input and output is not 100% liner (in to out) but this is WAY off?

FYI jumper on isolator board is set to voltage.

Btw, we adjusted signal isolator min & max on both mill and lathe with the same results.

What are we missing here?

[BillB]

Hey all, On my Tormach there is a calibration procedure to adjust probe tip runout. Basically probing a fixed surface and making adjustments in Path Pilot control and adjusting the set screws on the side of the probe to dial it in.
I’m assuming this is pretty standard for VMCs and knees mills to dial in a probe.

Is there a similar calibration method for CNC12 to dial in the probe tip for mill by using the probe to probe a surface and make adjustments in the control and or give you a sense of how much to adjust the set scores on the probe? OR do we only rely on mechanical adjustment on the probes set screws via test indicator?

OR is the only method to use test indicator on the tip of the probe? I have tested doing this on my lathe probe and its pretty tricky to get the right amount of preload on the indicator without influencing the probe tip. I have a disk end on the lathe probe so will be much easier than the mill probe with a 2mm ball. The slightest preload has some degree of effect on the probe end no matter how little preload. Are seams really counterproductive and uncertain because the probe spring is fitting the indicator arm? ?

Now I’m sure it doesn’t help that I only have 30.00 Amazon indicators. I’m sure a higher-end one would be better but that’s what I have for now.

Any input welcome on this.

There are two steps to calibrate a probe. Step one is to adjust the runout of the ball at the end. I did this with a "last word" type of indicator. The one I used has a needle with little side force compared to the spring force of the probe so there is no deflection. This is a relative type of measurement so even cheap indicators work. A normal dial indicator has a stiffer movement than a last word type. Also the last word type has a finer scale so small movements seem huge. Adjust tip runout to zero using the screw adjusters on the probe.

The second step is to calibrate the diameter of the probe. This is done by using the probe to measure the diameter of a known bore. The effective diameter of the probe is obtained by subtracting the measured probe difference between actual bore diameter and measured bore diameter from the diameter at the tip of the probe. I'm not sure I explained the second step right but it's pretty clear in the manual.

I’ve ordered a ring gauge defiantly a must have for all around cnc work.

What is the increment of last word type indicator you are talking about. The ones I have are .0005 whitch I though was pretty standard is the one you talking about even smaller increment?

[Upnorth]

I think the increment on mine is .0005". A complete rotation of the needle is .030".

[martyscncgarage]

It looks like the spindle speed range for the Sherline with the belt in the "Normal" pulley position is about 75-2800RPM. You have 0 programmed in the Min Spindle High Range in the Wizard.
When you ran the spindle bench test, I assume you had no wires connected to Spindle Analog output other than your meter correct? Do not try and run the spindle speed bench test with it connected to the KBSI-240D

Here is an old video I made setting up a KB Electronics Drive:


You need to make sure that the drive itself has all its pots set to the factory settings first. (WHICH KB Electronics drive are you using?) I see you are using the KBSI-240D Signal Isolator.


DO keep in mind that an encoder on the spindle does not close the spindle speed loop in CNC12. That is, if you call an M3S1000, CNC12 does not attempt to maintain 1000rpm at the spindle. The purpose of the encoder is to display actual spindle speed and to slave the Z axis for tapping and threading.

DC Drives can be finicky to setup.

You might run your spindle speed bench test again, with and without the KBSI-240D analog inputs connected to Acorn to see how close the values are as well. (the may differ slightly)

Marty