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Joy 12CM27 Continuous Miner

Maker:  Weiss Brothers
Model No:  029
Scale:  1:50
Review Date:  October 2021

Weiss Brothers Index
Mining Equipment Index

Cranes Etc Model Rating
Packaging   (max 10) 7
Detail   (max 30) 27
Features   (max 20) 15
Quality   (max 25) 22
Price   (max 15) 10
Overall   (max 100) 81%


Joy 12CM27 Continuous Miner Video 
The box.
Where to buy
At work.
Very detailed cutter head.
Etched grille.
Articulating conveyor.
Underside flap open.
Profile view.
On the road.

The Joy 12CM27 is a continuous miner used for underground applications with limited headroom.  It is a high-voltage electric machine, and the machine weight is around 75 tonnes.

Joy is part of Komatsu Mining.


It comes in a Komatsu / Joy branded box, which is delivered inside an outer shipping carton.   Inside, the model is contained between a pair of factory-sealed expanded polystyrene trays. 

There were no defects or missing parts on the review model.

No assembly is required.


The metal tracks are delicately detailed, and there is detail within the casting on the underside of the body with black screw heads standing out against the orange colour. 

Detailing under the loader plate is very good. On each side of the loader there are sharp Joy graphics, and the rams that adjust the angle of the plate are modelled but non-functional.  Inside the loader there is wear plate detailing, and the spinning loader arms are modelled well.

The metal conveyor chain runs up through the body with the chain a fixed part.  At the rear there is a nice rubber skirt detail where the conveyor has sideways articulation.

The casting details on the body sides are excellent and include tiny grab rails, with just paint thickness taking the crispness off some of the details.  Small graphics add to the detailed appearance.  At one end there is a an enclosure with what looks like a fan, and at the front there is a fine etched grille.

The cutter head boom is a suitably heavy looking piece with some plastic elements to add detail.  The colour match between plastic and metal parts is very good.    The cutter head is a detailed plastic part with highlighted picks.

As this is an electric machine it would have been nice to include a length of supply cable.


The tracks turn easily enough by hand.

The loading plate is fixed in position. However, the spinners can be rotated.

The boom can be raised and lowered, and the cutter head can be rotated.

At the rear, the conveyor can be raised to a good height, and the end part rotates from side to side.

Underneath, there is a small flap that opens. 


This a nice quality scale model with a high metal content. 

The paint and graphics are very good.


The price is reasonable given metal content.


It is good to see a new model of an underground mining machine, and this one is well executed by Weiss Brothers. The high point is some of the very high quality casting details.


This model first appeared in September 2021 .
Transport mode, although no parts are removable.
Looks very nice.
Loader plate with spinners.
Rear end.
Being loaded on to a low boy.