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A review of a Mini Mill from Little Machine Shop


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47 replies to this topic

#1
Modeler12

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Earlier I mentioned this little mill from Little Machine Shop and got several responses including a request to review this mill when I received and tried it out. Here is the start of this (perhaps ongoing) subject.

I will explain why I chose this model a bit later, but let me mention now that I had ordered the machine and tooling kit last Thursday. Today, Monday, it was at my front door. Not bad for a weekend delivery.

MM Review 1.jpg   MM Review 4.jpg

When I opened the smaller package of accessories I found the parts were all there as ordered. However, the first thing I noticed is that most metal parts were liberally coated with grease. Nothing new, of course, and perhaps necessary since all (or most) parts are made and shipped this way from China. I will be spending some time tomorrow 'degreasing'.

MM Review 5.jpg    MM Review 2.jpg

The same applies, of course, to the base and to a smaller extend to the top with its motor etc.

Overall, things are OK. The instruction manual, I am reading now, included a spare fuse on top. Not sure  yet where it goes, if needed. ^_^

 

I am going to skip over a lot of details later on and get into the guts of this thing (including why I think it is a neat little item for modeling work).


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Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#2
jud

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Come on, you've had 12 minutes to post some more, I sit in anticipation, trying to be patent. :10_1_10:

jud


Edited by jud, 25 February 2014 - 03:33 AM.

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#3
Modeler12

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Come on, you've had 12 minutes to post some more, I sit in anticipation, trying to be patent. :10_1_10:

jud

Ok Jud, please help me with the grease stuff.

Don't hold your breath, please.


Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#4
mtaylor

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Is it grease or cosmoline?   Either way, it's a pain. 



#5
jud

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Drop by, I have about 5 gallons of solvent in the shop, or you could use gasoline like we did when I was a kid to wash parts. If you have a buddy in auto or truck repair see if you can use their parts washer, save a lot of time and do a better job.

jud


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#6
WackoWolf

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They all come with the grease on them, it's for protection. My Sherline had it on the machine, on the bed and etc


Wacko

Joe :D

 

Go MSW :) :)


#7
Q A's Revenge

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Nice of you to take the time to do this Jay, I'm sure lots of folks are going to find your review very helpful. I'm also sure you're going to have lots of fun using this machine!

Vic.

#8
Modeler12

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OK. Here is an update. And Vic I am doing this also for my own 'review'. As I take these pictures I often realize something that I could have skipped over and learned the hard way later.

 

But first, here is the machine after cleaning it with some 'mineral spirits' or paint thinner. It was messy but not too bad. I then applied a thin coating of special oil designed for just that purpose. Then I started to assemble the various parts and learn what the controls and some of the features are. My admiral helped me steady the top when we mounted the top to the base with four screws. Note this is a rigid base model, not the type that you can rotate 45 degrees in both direction. Ones the unit is secured and checked for squareness, it should stay that way.

mm mill 1.jpg

 

You can see that the overall design is simple and compact. The controls in front include a digital readout of the spindle speed, a forward/reverse switch (something I may never use), an emergency stop button and the speed control potentiometer. The large round disk you see to the left is the fine adjustment knob for the z-axis movement. The coarse adjustment is with a wheel similar to what you see for the x and y. The z wheel is in the back. The start/stop buttons are along the left side.
 

The table is 15.7 x 5.7 inches, a lot larger than the other machines I looked into when I did my search. Likewise the x travel is 11.8 inches, the y =5.9 inches and the z=8.7 inches. What I like also is that the screws and the wheels you see are in decimal inches (not fractions such as the Grizzly mini mill). You can also get the machine with mm, I believe.

 

There were a couple strange things while assembling some of the parts. The draw bar that pulls the collets up into the quill was loose inside the quill and not visible. When I tried to insert a collet, it would not work. I climbed on top and found the drawbar sitting loose but upside down. Then when I tried to mount the vise (a nice 3" precision type) the two special pieces, that fit into the holes of the vise, would not make proper contact. The feet of the serrated plates would not go down further. I had to take them apart and flip the feet over to let me make the correct adjustment.

But these were just little things that is part of my learning lessons.

mm mill 6.jpg   mm mill 7.jpg

 

The next step I want to take is to make some adjustments of the gibs, the thin strips of steel in the dovetail beds in all three axis. There are some set screws along each direction that can be loosened or tightened to reduce the backlash and stiffness of the bed.

In addition I want to check the squareness of the table and mount the vise so that it is parallel with the x-axis. It involves using a good dial indicator and a magnetic holder that I happen to have.

All of this is described in the manual that is included, of course.

So more later.


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Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#9
Modeler12

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Here is Add #1.

The mill has a top spindle speed of 5000 rpm. Not bad, but not fast enough for those tiny drills we use.

On my old drill press I made a mod to adapt the old Dremmel-like tool that I have had for years. I did the same here.

 

The mill's head (motor and all) moves up and down with the quill. So I made a simple bracket out of aluminum, drilled and tapped some holes and adapted it to the motor frame. Now I have not made any modifications to the mill. I simply took out two #8-32 screws and replaced them with two a bit longer. I still have the old screws should it be necessary to go back.

The Monkey Wards tool fits snugly inside the wooden part that is bolted to the bracket and all is fairly stout. Not perfect, mind you, but good enough for this little motor that goes fast but does not need much force to spin a small tool.

Now I can mount a work piece on the table and use the precise way of moving it x and y under the Monkey W tool. The fine control nob (the large disk in front) can help to control the z-axis should that be important.

mm mill 9.jpg   mm mill 8.jpg

 

I don't even know how fast the Monkey W goes, but my guess is around 10,000 rpm or more. It has 120 vac input and I wonder if anyone knows of a simple way to control the speed of this thing.


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Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#10
capnharv2

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Glad to see it has fine feed in the Z axis Jay. I wish my Unimat mill had that (I can buy one on e-bay, but they get insane prices for them).

 

Looks like a fun and useful tool. I'm sure you'll have a good time with it.

 

Thanks,

 

Harvey



#11
Modeler12

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Glad to see it has fine feed in the Z axis Jay. I wish my Unimat mill had that (I can buy one on e-bay, but they get insane prices for them).

 

Looks like a fun and useful tool. I'm sure you'll have a good time with it.

 

Thanks,

 

Harvey

Harvey, as I am working with this little mill, I am finding other features that at first I did not consider important or at least did not think of.
 

Here is one more example: the digital spindle speed indicator.

On this model it is built in and right in front of my nose. The milling speed could be important and is related to the material being milled and the diameter of the cutting tool. On an other thread I saw a nice table of this and made a copy.

To get the indicator for the MicroLux machine from Micro Mark you would have to shell out an additional $140 plus.


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Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#12
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I hope you don't mind if I continue with a lot of details. But here are some more.

 

I checked the table 'flatness' in the x direction by mounting a dial indicator as shown below. As you would expect there was virtually no difference in the readings as I moved the table back and forth. I have not yet checked the y direction nor the amount of back lash.

mm mill 15.jpg

I mounted the vise and for that I again used the dial indicator to make sure the clamping faces of the vise were parallel with the x-axis. I used one of the parallel plates, one of a nice set shown below also. It took a few runs back and forth and some slight movements of the vise to get it to be with 0.001 inch. After tightening the nuts (which are difficult to get to because it requires a socket head wrench), I verified the readings again.

mm mill 16.jpg    mm mill 17.jpg    mm mill 14.jpg
 

 

Here are some negatives:

The mill comes with several wrenches but not all that I have used thus far. Below you see theirs plus mine.

For example, to make adjustments of the gibs requires a 2mm Allen head wrench for the x and y direction, but a 2.5mm wrench for the z direction. Neither one was included.

Then for the table locks the Allen head screw is 3mm. Here it would be nice to have a small handle, similar to the one for the z-axis.

The nuts for the clamps used for the vise are recessed and difficult to reach unless you have a 10mm socket head wrench (which I have, but was not supplied).

The little ring to set the depth of drilling has another Allen head screw which is also difficult to reach. A knurled knob would be better.

The draw bar for the collets is hidden inside the motor casing. You reach it from the top with the bent wrench shown below. However it is a bit of hit and miss to use it. Then to loosen it with a small hammer, again it is a hit or miss. I made a small wooden block that fits through the hole on top so I can hit that to loosen the collet.

mm mill 13.jpg

 

If nothing else these are a few nuisances but not too important. 

 

 


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Jay

 

For details about my Conny see http://modelshipworl...n-by-modeler12/

 


#13
garyshipwright

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Harvey, as I am working with this little mill, I am finding other features that at first I did not consider important or at least did not think of.
 

Here is one more example: the digital spindle speed indicator.

On this model it is built in and right in front of my nose. The milling speed could be important and is related to the material being milled and the diameter of the cutting tool. On an other thread I saw a nice table of this and made a copy.

To get the indicator for the MicroLux machine from Micro Mark you would have to shell out an additional $140 plus.

 

 

Hi Jay. Can you give a link to the thread with the nice table  sir. Wouldn't mind taken a look at it. Thanks and don't mind the details of this at all. Gary


Edited by garyshipwright, 26 February 2014 - 06:10 PM.


#14
Q A's Revenge

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Hi Jay. Can you give a link to the thread with the nice table  sir. Wouldn't mind taken a look at it. Thanks and don't mind the details of this at all. Gary

Might be this one.

MillingSpeeds_zpsde7e09ef.jpg
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#15
Q A's Revenge

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Some folks make these for their mills:

http://www.machinist...-for-mini-mill/

Finished-Wrench-Hammer.jpg
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