[Potatohead908]

I just picked up a Nordic Track 2.8hp....2.6hp continuous duty motor. I'm planning on doing the belt drive conversion for my G0704 mill and was wondering what motor controller is going to give me the most from this motor? Was thinking the KBMM-225D but wanted to ask others who know WAY more than me.

[Al_The_Man]

Should do the trick.
Al.

[Potatohead908]

Thanks Al.

Reading the spec sheet it seems that using this controller would leave 1.1hp of additional power untapped. I for one will have a hard time sleeping at night if this is true.

http://www.kbelectronics.com/data_sheets/kbmm.pdf says Maximum Horsepower, (kW)= 1.5, (1.1) if I use in conjunction with optional heat sink.

So this controller would work but I am wondering if there is something else that would be a better value. As in around the same price but would allow use of full power.

[Wiggles84]

If I found the same motor you got (found on ebay) it is 2.6hp @ 110v DC.

So if you get the kbmm-225D and supply it with 230 VDC and get the heat sink you should be able to get the full HP...... if I understand the manual right.

I'm sure someone else will chime in on this as well.

Andrew

[Al_The_Man]

Take the HP ratings of TM motors with a pinch of salt.
They definitely would not be able to supply this on a continuous basis.
Al.

[109jb]

You could use a MC60 treadmill motor controller. There are lots of instructions on how to wire them for using outside of the treadmill. The mc60 was used in 2.5hp proform treadmills, so should work fine.

[Potatohead908]

Would this be better? KBCC 225R

Used KB Electrics KBCC 225R KBCC225R 9924J DC Motor Speed Control 230VAC | eBay

This is the motor I bought.

Used Treadmill Drive Motor NordicTrack Proform Reebok Part 316327 | eBay

[hoss2006]

You'd be wasting your money, unless you really want to run at 220VAC. A 110 VAC kbmm-125 with heatsink can output up to 120VDC and will give you about all your gonna get out of that motor.
Just make sure to plug it into a 20 amp circuit, mine would pop a 15 run maxed out.
Like Al said don't take the hp rating as gospel.
Projects
Hoss

[Potatohead908]

Thanks to all for replying! Hoss will I have reverse with the KBMM 125?

[hoss2006]

No but you can add a dpdt switch for reverse like on the stock mill if you really think you need it.
Hoss

[Potatohead908]

Hoss, I don't know what I need. I'm very green to this! Knowing that I have the option to add reverse is good. Would you be OK buying a used one off eBay?

[Connor]

Thanks to all for replying! Hoss will I have reverse with the KBMM 125?

The KBCC-125R Has a reverse feature.. That's what I'm using.. You can find them on Ebay. KB Electronics DC Motor Speed Control KBCC 125R 9937G 115 Vac 0 90 VDC 16 Amp | eBay

Even though they say 0-90v, they go above that...

Thanks, Billy

[hoss2006]

Hoss, I don't know what I need. I'm very green to this! Knowing that I have the option to add reverse is good. Would you be OK buying a used one off eBay?

Having reverse is up to you, not something I'd see much of use for except for power tapping.
Using a tapping head is easier and you don't need reverse for that and with cnc you can threadmill too,no need for reverse either.
I'd only find it useful on a lathe.
I'm suspect of buying used electronics unless it's a real good deal to risk the gamble.
Hoss

[Connor]

Having reverse is up to you, not something I'd see much of use for except for power tapping.
Using a tapping head is easier and you don't need reverse for that and with cnc you can threadmill too,no need for reverse either.
I'd only find it useful on a lathe.
I'm suspect of buying used electronics.
Hoss

I use mine for Rigid tapping (Spindle has full encoder). Works great.

[Potatohead908]

I use mine for Rigid tapping (Spindle has full encoder). Works great.

Can you explain what rigid tapping is and what purpose the full encoder has?

[Potatohead908]

Having reverse is up to you, not something I'd see much of use for except for power tapping.
Using a tapping head is easier and you don't need reverse for that and with cnc you can threadmill too,no need for reverse either.
I'd only find it useful on a lathe.
I'm suspect of buying used electronics unless it's a real good deal to risk the gamble.
Hoss

Hoss, I bought your plans and am about $450 in supplies away from full CNC. How accurate is thread milling? I know that it will depend on how accurate your mill is. Say if I wanted to thread a receiver on a rimfire rifle to accept a threaded barrel....would thread milling be an acceptable practice?

[Al_The_Man]

Normally when using most of the KB 2 quadrant drives, you should use either the I1 and I2 inputs for disable when reversing or whatever the enable equivalent is, this ensures that the motor will go through acceleration on FWD/REV, a KB 4 quadrant drive is setup-capable of ±10vdc input for reversing and dynamic braking so no REV relay is required, also has tach input option.
The other features of the KB drives is the SCR versions are a bit 'choppy' especially audio wise at low rpm, the PWM versions are much smoother/quieter.
BTW, make sure you remove any flywheel!
Al.

[SCzEngrgGroup]

Hoss, I bought your plans and am about $450 in supplies away from full CNC. How accurate is thread milling? I know that it will depend on how accurate your mill is. Say if I wanted to thread a receiver on a rimfire rifle to accept a threaded barrel....would thread milling be an acceptable practice?

Thread milling is as accurate as your machine, and your G-code are. You have complete control over thread proflile, major and minor diameters, and pitch, so you can make the thread dimensions whatever you need them to be. The threads come out beautiful. And a single tool can cut a wide range of both Imperial and Metric threads, both internal and external. The only downsides are the cost of threadmilling tools (typically $50 and up for a single-point tool, and much more for multi-point tools), it is slower than tapping, doing small holes will require small tools. In general, for anything under about 3/8", tapping usually makes more sense. Above that, threadmilling will often make more sense.

Regards,
Ray L.

[hoss2006]

Hoss, I bought your plans and am about $450 in supplies away from full CNC. How accurate is thread milling? I know that it will depend on how accurate your mill is. Say if I wanted to thread a receiver on a rimfire rifle to accept a threaded barrel....would thread milling be an acceptable practice?

Yes, the g0704 is certainly capable and you don't have to buy real threadmills if you want.
Might take a bit of practice on some scrap first if you don't have the skills yet but these show what it is capable of doing.
Hoss

This one is on your dvdrom.
https://www.youtube.com/watch?v=Suwl_HzouVU

https://www.youtube.com/watch?v=Qn88X0raHck

[Potatohead908]

Thank you all for the information!! Hoss I am going to PM you in regard to another question. Thanks again all!