Spin High/Med/Low

All things related to the Centroid Acorn CNC Controller

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Philtrueman
Posts: 4
Joined: Mon Jan 03, 2022 11:52 am
Acorn CNC Controller: Yes
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CNC12: Yes
CNC11: No
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CNC Control System Serial Number: none

Spin High/Med/Low

Post by Philtrueman »

Can someone tell me, what is the function of these buttons on the Acorn VCP?
I have a 4 speed belt drive pulley reduction for the spindle speed. Can i program different spindle speeds to suit the different spindle gearing ratios?
The only other option is to fit a larger spindle DC motor so that i can have only one drive belt on my Boxford 250PC lathe.
tblough
Posts: 1865
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CNC Control System Serial Number: 100505
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Re: Spin High/Med/Low

Post by tblough »

CNC12 has provision for up to four spindle gear ratios. This allows for high/low gearing like on a Bridgeport knee mill, or a lathe with a gear-head spindle. Centroid will apply the appropriate gear ratio and display/command/use the correct spindle speed.

The issue is how to tell CNC12 what gear you are using. One way it to add microswitches to the transmission on the device and connect these to unused inputs, and then customize the PC to react to those inputs.

Another way is to use manual switches or buttons (like the VCP) to manually tell CNC12 when you have changed gears. This is the cheap and easy way, and for some, all that they need.

Look at parameters 65-67 in the mill or lathe operator's manual.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
Philtrueman
Posts: 4
Joined: Mon Jan 03, 2022 11:52 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: Spin High/Med/Low

Post by Philtrueman »

I have had a look at parameters 65,66,67 Do i enter the drive reduction ratio in these fields? My lathe has 4 belt drive reduction speed ratios. How do i enter another 4th speed ratio to make it 4 speeds? I also tried to enter the gear ratios in the low and medium boxes but it will not allow any numbers other than 1 or 0.
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cncsnw
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Re: Spin High/Med/Low

Post by cncsnw »

The highest range uses the maximum speed you set on the Control Configuration screen (or on whatever Wizard page provides the value for the Control Configuration screen). There is no gear-ratio parameter for the highest range.

Parameters 65, 66 and 67 are the speed fractions for lower gear ranges. These lower ranges are generally called low; medium-low or mid-low; and medium-high or mid-high.

For example, if in your lowest gear the spindle runs at 1/8 of the speed it would be running in high gear (for the same motor speed), then you would set Parameter 65 = 0.125.

Note that actual motor RPM is generally not relevant. If even your highest gear has some speed reduction (or increase) between the motor and the spindle, it is the spindle speed (not the motor speed) that you put on the Control Configuration screen. Parameters 65, 66 and 67 are fractions of the high-range spindle speed, not of the motor speed.
cnckeith
Posts: 3825
Joined: Wed Mar 03, 2010 4:23 pm
Acorn CNC Controller: Yes
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Re: Spin High/Med/Low

Post by cnckeith »

fyi.. for anyone else reading this thread the wizard spindle setup menu supports up to three ranges,
and you can use the CNC12 parameters if you have more than three ranges.
spindle range.PNG
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
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