New Grain Mill – The MillMaster MiniMill

By | October 8, 2012

Post updated June 7, 2013 – see shaded box at end of post.

Nine months ago on a Thursday evening at the monthly meeting of the Canberra Brewers I was lucky enough to win in the raffles – a MillMaster MiniMill.
MillMaster MiniMill & Crankenstein

Although up until this point I had been (very successfully) using my modified Marga Mill and I had just purchased a second hand Crankenstein, I was excited about finally having a decent shiny mill at my disposal.

After winning the mill and immediately selling the Crankenstein to a fellow brewer who was also trying to win the MiniMill we were both offered the skills and time of the club president Tom Dixon to make us a steel stand for them.

Despite that being in February, this month (October!) finally saw the ongoing saga come to a close and a fully motorised brand new grain mill is now sitting proudly in the brewery.

Pete (the new owner of the Crankenstein), Tom and I got together on a Saturday and Tom quickly got us to work cutting and grinding all the pieces for the stand he devised based on our mills and motors.

I had already purchased a worm motor from Motion Dynamics who had been discussing requirements for brewers and their mills on AussieHomeBrewer in details for a while, I had seen others use motors and pulleys and even windscreen motors but I was happier purchasing something I knew was made for it.

After spending the day at Tom’s and a few beers later (not to mention the work involved) I walked away with a nice solid stand welded together by Tom himself.

Make sure it's right!Tom preparing to weld it up

Bringing it home this was only the start of the ordeal with me needed to now wire up the motor to a power supply, speed controller and then finally to the mill.

I initially chose a PC PSU due to having one lying about in the garage but after modifying it to suit I discovered it was dead and needed to find another solution – this solution ended up being a 12 volt, 29 amp PC server PSU from eBay.

Ready to try it outOnce the power supply arrived I chose an outdoor electrical power board enclosure which was the right width for the stand, this would keep the PSU and controller board safely out of reach and also out of the potential grain dust from the mill.

After sizing it all up, I cut out all the holes needed, rigged up some mounts to attach it to the stand and then gave the enclosure and stand a nice coat of paint.

Once the paint dried it was time to put it all together and do the final wiring before sitting back and admiring the new grain mill.

A few moments later I measured out a kilo of grain for the final test and put it into the hopper and switched on the mill to hear it fire up and purr along milling much faster than the Marga ever did.

The final list of items and equipment ended up blowing out after I purchased a Dremel as well, being something often talked about I decided to go and grab one – how did I live without it before!

Apart from that budget blower and the steel, mill, and motor it was pretty much some wiring, screws and connectors as well as the enclosure. I had a lot of items lying around from previous projects so it all worked out pretty well.

Next job is to work on a larger hopper as the current one (official millmaster hopper) only fits about one and a half kilo of grain – not enough for the double batches I’m now brewing and I didn’t realise it was that small until after I ordered it from Craftbrewer. Not to worry though as I have a plan which will still utilise it but also add another 10kg or so.

[color-box color=”gray”]UPDATE – June 7, 2013

There has been a lot of interest in this since I originally posted this article. I have just updated the link in the story to the right worm drive so people can see which I chose.

The power supply which is something like this from eBay and the rest of all the electronics are housed in an outdoor power cable box from Masters I picked up for about $10.

Due to the difference in shaft size between the mill and the motor (12mm and 12.7mm) I originally chose a small Jaycar Spider coupler which I drilled out to suit – it doesn’t look like they have them on their site any more but it looks like this. I’ve since found these little pre-drilled ones on eBay – I have yet to connect it up but it’s waiting until sometime when I do.

I found a solution to the hopper and that was a water bottle – you know, the ones like you see in a doctors waiting room. I currently have a 12L one from Officeworks but I now have a larger 15L Neverfail waiting to be modified.

It simply fits into a wooden lid I made from bits lying around to suit the shape of the existing hopper – it now fits almost a full double batch, fill it up, turn it on and walk away!

That’s pretty much about it, the rest of the electronics were all tidied up with heatshrink wrapping and zip ties, and the mill works very nicely!


Check out the photos here on Flickr and the video is also available on YouTube.



17 thoughts on “New Grain Mill – The MillMaster MiniMill

  1. Pete

    Nice work on the mill, looks like it works perfectly.
    I was curious – what are your thoughts on the Crankenstein 3 roller vs the Millmaster? Does the 3rd roller offer any benefits? Which is easier to use, adjust, or gives a better, more efficient crush?

  2. rohan

    Amaazing job on the mill!! My Crankandstein is on its way and would like to motorise it in a similar fashion. Big Ups!

  3. Nicholas Wiseman Post author

    Thanks for the comments fellas.

    I never actually used the Crankenstein I had here for a short while so I can’t really comment on it’s use but a lot of the mills people use have only two rollers and work fine.

  4. Peter

    Fantastic, I will make something very similar to this unit, I love it. Just ordered most of the parts so I had better get cutting and welding. Cheers

  5. Jeremy

    Mate, awsome as. Hats off to ya. Just wondering the size of the worm motor purchased from Motion Dynamics and the cost?

    1. Jeremy

      Thanks Nicholas,

      Could i ask one more question about the shaft and coupler. Did you have this specially made to step up to the mills larger shaft.

      1. Nicholas Wiseman Post author

        I got the shaft from a metal supply place and then bought the Jaycar coupler (, it looks small at first but seems tough enough, it just needs to be drilled out to suit each shaft (.5 mm different off the top of my head).

          1. Nicholas Wiseman Post author

            No worries, let me know if you need anymore details.

        1. Jeremy

          The mill is all built mate and thank you so much. It is sitting in our brewery at U-Brew It Albury/Wodonga. Made a few changes, including the bigger perspex hopper.

  6. James

    That’s awesome….

    Where did you get the coupler and how much was it?

    you’ve done a fantastic job

    1. Nicholas Wiseman Post author

      Hi James, I got the coupler from Jaycar, it was about $10 or so, search the site for spider coupler and you should find it.
      Thanks for the comments!

  7. Lance

    Wow…this is brilliant. I have the mill, motion dynamic parts, coupler and power supply. I was just searching on builds that people have put together and came across this!!

    Could I ask how you fixed the power supply and electronic board into outdoor power box? Also, how did you then attach the box to the stand? I was going to use some angle iron to attach to a stand, but was curious if you did something different.

    Again….awesome job!

  8. Mat

    That was one of the most in depth and inspiring brew builds I have read over the years.

    Just ordered everything you recommended..

    Now.. have to listen to the wife about spending too much $$$


Leave a Reply

Your email address will not be published. Required fields are marked *