CX601 Milling Machine

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Brian Rupnow

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So--Here we are with the head off the mill, setting on a small framework made of 2" x 8" lumber. So far this is pretty easy. There is one major bolt that holds the head to the vertical slider mechanism, and it is accessible from the front side of the machine. There is also one fairly major stud and nut combination which, when loosened allows the head to tilt left or tight to tram the mill head. The entire head pivots on that first major bolt. The entire head which unbolts is extremely heavy. I made sure that the head assembly was only a fraction of an inch above the wood framework before removing the pivot bolt and stud , because I didn't want to have to lift it when it came free. There is an inspection plate on the back side of the head, which I can now access to see whats happening in there. I will swing the entire head and wooden support frame around to give me clearance to remove that inspection panel and look inside.
 

Brian Rupnow

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This picture shows the gear selector moved over to "low range" and the gear has moved so the damaged gear meshes with another gear to give "low range". --It hasn't moved all the way into position because of the damaged teeth. I think my next stunt will be to remove the motor and hopefully the damaged gear will come out with the motor. This will give me a chance to check the teeth on the gear which the damaged gear meshes with.
 

Brian Rupnow

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Okay--My bad. The gear in question wasn't on the motor shaft. I pulled off the motor and motor plate, and see that there is a jackshaft between the motor shaft and the mill spindle. The bad gear is on this jackshaft. I have to disconnect some wires, so this is the point where I get out my sketch pad and start drawing pictures with wire colors on them so that after I disconnect them I can remember how it all goes back together. I see a c-clip on the end of the jackshaft, so now I will disconnect the motor and set it aside, still bolted to the motor plate.
 

Brian Rupnow

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And here is the nasty wee bugger that caused the problem. I did have to phone Busy Bee in Concord to ask how that shaft came out. I thought I seen how it came out, to free up the gear, but I have been bitten on the arse before by "What I thought!" I did have to use my snap ring pliers to remove a couple of bearing retaining snap rings, then drive the shaft out from the bottom with a brass drift punch. I checked out the gears which this one meshed with, ---They are steel and suffered no visible damage. The new gear costs $55 and they have 44 in stock. I will drive to Concord (north Toronto) tomorrow and buy a new gear.
 

awake

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Looks like these gears are some sort of plastic? Perhaps to allow any destruction to occur here while saving the steel gears and the rest of the drive train.
 

Brian Rupnow

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Okay, we're good here. I drove down to north Toronto this morning and picked up a new gear. (I get lost every time I drive into the city, and usually get lost when I try to get out again). Brought the new gear home, installed it, greased everything well and the mill is a runner again. No strange squeals, groans, or thumps. I knew before this all happened that my mill had to be trammed, so after I finish this post I will tram it.---Brian
 

Ghosty

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Brian,
It happened once, did you get a spare as well? Would save a long drive with getting lost again.
Cheers
Andrew
 

Brian Rupnow

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Andrew--If it happens again I may just go looking for a new mill. It's not that long a drive for me--only about 50 miles from here to there.
 

BaronJ

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And here is the nasty wee bugger that caused the problem. I did have to phone Busy Bee in Concord to ask how that shaft came out. I thought I seen how it came out, to free up the gear, but I have been bitten on the arse before by "What I thought!" I did have to use my snap ring pliers to remove a couple of bearing retaining snap rings, then drive the shaft out from the bottom with a brass drift punch. I checked out the gears which this one meshed with, ---They are steel and suffered no visible damage. The new gear costs $55 and they have 44 in stock. I will drive to Concord (north Toronto) tomorrow and buy a new gear.
Hi Brian,
My mill is the same as yours. I made a steel replacement for that gear when the plastic gear gave up. It also cured a rhythmic thumping sound that I had from new, which turned out to be caused by the gear not being concentric with the shaft. The plastic gear is used to reduce the noise created by the gears. In my case the noise has reduced.

As far as new mills are concerned, I've been looking at a Sieg SX3.5DZP. All the mods that I've done to mine are standard.
 

Swissmat

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A new X axis reading head bracket shaped as shown, will let me get the holes into the dark blue 0.9" off the dark green surface (which is as close as I can get to it with my electric drill without disassembling my milling machine) and still allow me to mount the glass scale almost 1/2" below the top of the milling machine bed For the guard, I think I will forget about a flange along the top and just use a piece of 3/16" thick aluminum angle, supported at the ends only. This lets me keep the top of the angle down 1/16" below the top of the table and leaves 1/4" clearance between the underside of the angle and the top of the glass scale.
Hey Brian,

I have that same mill and am working on some bracketry and such. Are you able to share your 3d model somehow? Maybe as a .step file? Would be greatly appreciated!
Mat
 

RonW

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Andrew--If it happens again I may just go looking for a new mill. It's not that long a drive for me--only about 50 miles from here to there.
Hi Brian,
I'm in the process of looking for a mill. The toss up has been between the PM25-MV and the CX601. I like the belt drive of the PM and after your and others hassles with the plastic gears in the CX I'm leaning that way. The PM I'm looking at also comes with 3 axis DROs. How long have you had your CX and what is your overall impression. It seems quite a lot heavier than the PM and also has a bigger table. How difficult was it to install the DROs on your machine?
Ron W
 

Brian Rupnow

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I have had my machine for 5 or 6 years now, and I am very happy with it. Installing the DRO system makes you scratch your head a bit, but is not terribly difficult. If someone wants my 3d cad files, email me at brupnow@rogers.com and I will send them to you as .step files.---Brian
 
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