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Machine Shop and Tool Talk

Cincinnati Knee Mill with an NMTB 40 Taper


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  #1  
Old 12-24-2009, 09:27:52 AM
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Default Cincinnati Knee Mill with an NMTB 40 Taper

I bought a Cincinnati knee mill with an NMTB 40 taper. What is the difference between a CAT 40 and an NMTB 40 tool holder?
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Old 12-24-2009, 01:14:48 PM
ronm ronm is offline
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Default Re: #40 Taper

for some reason, I saved this when I ran across it-you never know...
http://www.tools-n-gizmos.com/specs/Tapers.html
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Old 12-24-2009, 01:40:26 PM
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Chuck Rhoades Chuck Rhoades is offline
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Default Re: #40 Taper

I've used both in my mill a Gorton Mastermill. I had to make a longer drawbar for the cat 40 but they worked equally well.
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Old 12-26-2009, 11:00:18 AM
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Default Re: #40 Taper

Thanks guys. This is the info that I needed. Same taper and same threads. The length can be easily dealt with.
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Old 01-22-2010, 01:59:27 PM
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Default Re: Cincinnati knee mill with an NMTB 40 taper

I finally got a couple of pics of my "new" mill.
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Old 01-04-2011, 02:43:55 PM
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Default Re: Cincinnati knee mill with an NMTB 40 taper

I finally got the mill moved into the shop. I was playing around with it and have a couple of questions. There is a small crank wheel on the front of the headstock. What does it do? This machine DOES have power feed on the quill. There are a couple of reservoirs for oiling the ways. What kind of oils should be used?
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Old 01-04-2011, 04:38:11 PM
Richard W. Richard W. is offline
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Default Re: Cincinnati knee mill with an NMTB 40 taper

If you put the feed direction lever on the head in neutral, then engage the feed lever you can manually run the spindle up or down. Depending on which direction you turn the wheel. This gives you a fine hand feed, just like a Bridgeport.

Richard W.
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Old 01-04-2011, 06:14:33 PM
Heller D. Davis Heller D. Davis is offline
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Default Re: Cincinnati knee mill with an NMTB 40 taper

Andy I use Vactra #4 Way oil from Enco in all my lathes and mill.
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Old 01-16-2011, 11:36:50 PM
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Default Re: Cincinnati knee mill with an NMTB 40 taper

Finally got the mill running today. I'm using a homemade Rotary Phase Converter 230V. I rewired the spindle motor for low voltage and got the 115V control circuits figured out. The table feed work without changing anything which confuses me a little bit. Does the table feed have a clutch between the motor and gearbox. There is a bit of noise and slippage at the higher feeds that I can't figure out. After about 10 minutes of running the spindle motor the entire machine shuts down. Any clues what I need to look into? What is the proper way to run the spindle feed? It appears to work but I can overcome it with the handle on the side. The handle on the front doesn not really seem to do anything
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Old 01-17-2011, 06:44:38 AM
Steve NW Ohio Steve NW Ohio is offline
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Default Re: Cincinnati knee mill with an NMTB 40 taper

Shuts down after 10 minutes, sounds like a thermal over-load issue. Have you checked the amp draw on the system yet. Check on the primary feed side of your circuits, if you haven't already - the over-loads probably need to be changed to accomodate the lower voltage whioch will rsult in higher amperage draw. Steve C
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Old 01-17-2011, 08:38:50 AM
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Default Re: Cincinnati knee mill with an NMTB 40 taper

Quote:
Originally Posted by Steve NW Ohio View Post
Shuts down after 10 minutes, sounds like a thermal over-load issue. Have you checked the amp draw on the system yet. Check on the primary feed side of your circuits, if you haven't already - the over-loads probably need to be changed to accomodate the lower voltage whioch will rsult in higher amperage draw. Steve C
Is changing the overloads a difficult or expensive thing to do? I would guess that 1/2 the voltage probably means double the amps. So the overload makes sense.
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Old 01-17-2011, 09:27:14 AM
K D Redd K D Redd is offline
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Default Re: Cincinnati knee mill with an NMTB 40 taper

When you rewired the motor from high to low voltage you caused it's current draw to double. Most industrial machines have heater coils on the contactor that are amp rated. If to much current is pulled through them, they heat up and cause the contactor to "Trip Out" If the contactor is old, finding the correct heater for the higher current you need may be impossible. If you can not find the heaters you will need to replace the contactor. If you have current protection on your Phase Converter, I have them on mine, you could put jumper wire in the place of the heaters. This would by-pass the current protection built into the contactor. Not recommended but if you need to replace the contactor because you can not find the heater for it, the new contactors can be PRICEY.

Kent
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Old 01-25-2011, 02:18:22 AM
prybar prybar is offline
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Default Re: Cincinnati Knee Mill with an NMTB 40 Taper

In my Cincinnati I use NMTB 40.
From past experience, Home made or Phase-a-matic rotary, be careful, you should always use a voltage stabalizer. Phas-a-matic makes them I had a factory rotary that worked fine but L3 was putting out way to much voltage, wich can overheat the heaters, not to mention it hard on motors. Solved all my problems. And I run 7 milling machines.
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