Nigel Lawton MPD18 MKII Bogey Assembly

I purchased this bogey from Nigel Lawton in the UK.  Although his web site offers a number of different products, this link points to the page for his MPD-18 MKIII bogey.  It was designed to power two products by Meridian Models.  It appears as though these products are no longer available so Nigel is selling the drive to whoever can use one.

I’m very impressed with this bogey.  It has roller bearings for the Layshaft and brass bearing for the drive wheels.  I haven’t found a host for this bogey unmodified, but I will.  It is just a matter of time.  This is an image of the parts that come in the package.  As soon as this drive is complete, assuming it runs as well as I think it will, I will order one or two more.  Those bogeys will be kit bashed to deal with issues with motor height and wheelbase in a couple of models I want to build.  But I wanted to get an ‘as issued’ drive under my belt first.

MPD18-6

I matched the parts to the parts list in the supplied instructions and they were all there.  I’ll talk about the parts as I use them.  Note that these are really small parts, even the motor which is 8mm x 16mm.

I used two sets of instructions in assembling this bogey.  The first set was Nigel’s instructions in the form of a color PDF.  The instructions that ship with the unit are black and white.  I also jumped to the Meridian Models site from Nigel MPD18 MKII page.  Once there I located the page for the drive.  The instructions for the MKIII drive were never posted.  But there are instructions for the MKI drive which is similar.  The parts are nearly identical but the photo etching is different.  These instructions are a bit more detailed than Nigel’s and they cleared up some questions I had about Nigel’s instructions.

Here is Nigel’s MPD18 V3.1 etching.

MPD18-5

The second assembly from the bottom is layshaft bracket.  I rocked a exact knife blade across the two connection points to separate this part from the etching.  Then I used a riffler file to remove the rest of the connection and smooth the edge.

MPD18-2

There are two score lines 20% and 80% into this part.  I bent along the score lines.  Then I bent along the score along the top 1/4 and bottom 1/4 of the part.  When finished, I had this.

MPD18-10

I then pulled together the rest of the parts for this assembly.

MPD18-11

At right bottom are the two roller bearings.  Above and to the left are two Tenshodo worm gears.  To the left of the worm gears is Nigel’s 5mm pulley And just above other parts is the 1.5mm diameter layshaft which is 30mm long.

Before I put together the layshaft assembly, I wanted to deal with something that was nagging me in Nigel’s instructions relating to ‘clipping the layshaft assembly in place in the chassis.  So I removes the chases from the etching and folded along the score lines, ending up with this.

MPD18-9

Note that there is a V cut 1/3 of the way in from the left.  There is also a notch in the vertical part of the chassis.  Aha!!! So I test fit the layshaft bracket in these notches.

MPD18-8

You can see the tabs sticking out at the end of the vertical part of the chassis and the V notch.  Once the layshaft assembly is complete, these will be bent over.

Assembling the Layshaft is the next step in their sequence.  A few months ago I picked up  MicroMark Press-It along with some accessories.  I decided to practice on the wheels first, removing the non-insulated wheel from the shaft.

Wheels-PressIt

So I set up the Press-it as shown above.  One wheel went on each side of the notch with the insulated wheel up.  I pressed on the axel with the tool with a 1.5 mm shaft.  The wheel popped right off the shaft.  Cool.  I repeated that step on the other wheel.  Cool again.

I still didn’t have the nerve to take on the Layshaft.  So I decided to press the 1.5mm to 2mm adapter bushing into one of the wheel gears.  I placed it on the end of a tapered modeling tweezers and pushed it into the bushing.  It went most of the way in.  I finished the job with the Press-it with a flat tool inserted in the end.  Why are there no pictures?  I thought I’d take the pictures on the second gear.  But before I could insert it, the bushing took flight on my floor.  I’m still looking.  Worse case I’ll need to order another.

Leave a Reply

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

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>