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Kris Avonts

depth setting aid for proxxon MB200 drill stand

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I have an MB200 drill stand from proxxon and I mostly use it for precision milling work. As a drill stand it only has a handle to do the setting of the depth that is indicated by a mm scale. For small depth settings below 1 mm it becomes difficult to adjust the depth to the wanted value.

So I decided to improve the MB200 and fit an auxiliary depth feed screw on top.

 

AS depth feed screw I use a micrometer head with 13 mm range (bought in China for 9 euro’s, but works very well). All the other parts to fix it on top of the MB200 are aluminium that I had available (piece of 40x20mm rectangular profile, 2 mm thick and some 5 mm thick flat extruded profile).

 

Here is a model of what I tried to make.

milling-depth-adjuster.png.d70a995a209e6912c95260e0496b6d08.png

 

It is just a support (the rectangular alu profile) that needs an inside rounding at its bottom to fit the die-cast aluminium body (R=40 mm) of the MB200. On top of that there is a lid with 2 holes (20 mm apart) to mount the support with 2x M4x35 to the body. It also has 2 holes with M3 thread to fix the micrometer holder plate in 2 positions.

 

Here are the machined parts.

DSCF2282k.jpg.83bb2e9b178c4e3ae0dffad5aa7a02e4.jpg

 

Next you see the MB200 with the 2 marks where a thread M4 is to be made and in a larger drill stand just before drilling with 3.3 mm.

DSCF2281k.thumb.jpg.fe00d32422989262b3066b9000ec3c96.jpg

 

DSCF2285k.thumb.jpg.f99957b671d4c50a5bd6784e2ce61114.jpg

 

Then I only need to show the end result. The micrometer head can be mounted in 2 positions. Straight for milling and at 90° for drilling.

DSCF2287k.thumb.jpg.deba246bd51ce088b3896e30cec276c0.jpg

 

DSCF2286k.thumb.jpg.67f080c86c3d8c01b24e0e1226890a8b.jpg

 

For milling I remove the handle and after a depth adjustment you always need to lock the set screw of the dovetail again.

 

I hope anyone in need of fine milling and owner of a proxxon MB200 can find some inspiration here.

 

Best regards,

Kris Avonts

 

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Hi Tony,

 

The micrometer shows no play nor backlash, so it should be precise up to 0.01 mm.

I paid much attention to mounting the support very level both horizontal and vertical.

In order to make the fit between the proxxon body and the support almost perfect, I filed the

rounding by hand. But that was not perfect, a little tilting was still possible.

So I decided to use some metal epoxy glue on the edges of the support and stretched some plastic kitchen foil over the proxxon top.

After positioning the support on the plastic, I checked with a level tool and let the glue harden overnight.

That resulted in an almost perfect fit without play.

I still have to test its actual precision.

As you might know 'the proof of the pudding is in the eating'.

 

Kris

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It was the fit between the rotating head and the body that was out in my case, in addition to the fact that the support in these Proxxon stands is a bit flimsy. I'd be intrigued to know how accurate the MF70 mill is in terms of verticality, feed and consistency. At the moment I get by with the modifications I've made but I keep wondering whether it would be worth the expense to buy the MF70.

 

Tony

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