Gear ranges

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Dave_C
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Gear ranges

Post by Dave_C » Thu Nov 16, 2017 8:11 pm

I've just printed out the Centroid manual before I attempt to convert my very successful Lathe conversion from Mach 3 to an Acorn setup.

Here is my question: How does the Centroid software account for the fact that I have 9 gear ranges to choose from? I use the 1,000 RPM range the most but I have 1,400 available when I need it and I also need some of the lower gears for large diameter threading.

Dave C.
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DICKEYBIRD
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Re: Gear ranges

Post by DICKEYBIRD » Thu Nov 16, 2017 8:59 pm

The spindle setup tab in the Config Wizard has low, medium & high speed ratios already but if you need more I'm guessing it will require some programming of the PLC.
Milton in Collierville, TN

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frijoli
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Re: Gear ranges

Post by frijoli » Thu Nov 16, 2017 9:09 pm

Dave_C wrote:
Thu Nov 16, 2017 8:11 pm
I've just printed out the Centroid manual before I attempt to convert my very successful Lathe conversion from Mach 3 to an Acorn setup.

Here is my question: How does the Centroid software account for the fact that I have 9 gear ranges to choose from? I use the 1,000 RPM range the most but I have 1,400 available when I need it and I also need some of the lower gears for large diameter threading.

Dave C.
There is only 3 ranges I am aware of that are in Acorn.
Most people use a variable speed motor and 1 to 3 physical gear ranges. That way you can have adjustable/constant surfaced speed.

Your gear box probably has 3 gear sets with 3 speeds in each. With a variable motor you pick one of the three main gear sets, and then let the motor do the work from there.
Outside Winston-Salem, NC

martyscncgarage
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Re: Gear ranges

Post by martyscncgarage » Thu Nov 16, 2017 10:55 pm

Dave_C wrote:
Thu Nov 16, 2017 8:11 pm
I've just printed out the Centroid manual before I attempt to convert my very successful Lathe conversion from Mach 3 to an Acorn setup.

Here is my question: How does the Centroid software account for the fact that I have 9 gear ranges to choose from? I use the 1,000 RPM range the most but I have 1,400 available when I need it and I also need some of the lower gears for large diameter threading.

Dave C.
No VFD Dave?
I had a Bridgeport Romi EZ Path with the Centroid Control on it. It was a gear head. BUT it was fitted with a VFD. 3 Gear ranges were chosen, (Low, Medium & High ranges) then the VFD would control the speed within those ranges. You would then use the SPIN HI, SPIN MED, SPIN LOW buttons on VCP.
Add a spindle encoder at 1:1 and you are rockin'! :D

I have a hunch you have a single phase motor?

Marty
Last edited by martyscncgarage on Fri Nov 17, 2017 6:56 pm, edited 1 time in total.
"Jack of all trades, master of none!"
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Dave_C
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Re: Gear ranges

Post by Dave_C » Fri Nov 17, 2017 3:25 pm

Marty,

Nope, I have a 2 HP 3 phase motor with a 2HP VFD. So I'm good with just using three of the gear ranges as that is about all I use now! I see no reason to complicate the issue now that I have read the above post. I could still use the spindle manually if there was something that did not fit in the 3 ranges.

IE: Big diameter part needing slow RPM for outer edge turning. I have my VFD set for constant torque so maybe not a problem?

Common sense I guess, I just had not thought it through and I was still thinking in terms of how Mach 3 handled the gears.
Grizzly G0678 CNC conversion with Acorn in progress!

Centroid_Tech
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Re: Gear ranges

Post by Centroid_Tech » Fri Nov 17, 2017 6:54 pm

Dave,

If you wanted to use all 9 gear ranges, you could but as DICKEYBIRD stated, the PLC program will have to be modified in order to take all of those gear ranges into account. The base PLC program has logic for 3 ranges. In addition to the modified PLC program, you will also have to create a custom macro for each individual spindle gear range as the control needs a way to determine which gear range it's in. You can do that either via an input or via a macro. Since you are limited on the amount of inputs with the ACORN, the custom macro is the way to go. On top of that, you will also need to associate parameters for the gear ratio for all of those gear ranges so that the Centroid control can supply the appropriate voltage to the VFD. The base PLC program uses parameters 65 and 66. Thanks.

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