Dhu Varren Posted April 12, 2015 Share Posted April 12, 2015 Much has been said over the last few months about a suitable chassis for the Silver Fox 001 Class kit, and the running qualities of the Lima/Hornby Deltic chassis. With an 001 Class kit waiting to be built, I decided not to take the easy option by using the aforementioned Deltic chassis, but to construct a chassis of my own. This was to have all wheel drive and pickup, flywheel motor and DCC sound. The project started by constructing a chassis frame out of brass. The floor was made from brass sheet, about 1mm thick, and the sides from 6mm brass strip. The floor pieces were cut to shape, to be a snug fit into the body, and the sides soldered on. The ends of the floor were shaped to the inside profile of the body ends, so that they rested on the lip behind the buffer beams. This meant that the bottom of the floor was almost flush with the bottom of the bodysides. Stage two was to prepare the bogies. They were originally from an Athearn SD40 loco, but the sideframes were from something else. A hole was drilled in the centre of what had been the Athearn swivel pad. A spacer made from a piece of 6mm brass strip was also drilled, and superglued to the swivel pad, ensuring that the holes lined up. The holes were then opened out to the size of the head of an 8BA screw, which would be the pivot pin. Two lengths of 6mm brass strip were cut to fit exactly between the sides of the chassis, and an 8BA screw fitted in the centre of each. The screws were cut flush with the top of the strip, and the heads on the bottom would become the pivot pins for the bogies. Once the required height of the chassis had been decided, the cross pieces were soldered in place. The bogies were then fitted to the chassis, and all dimensions checked. The bogie sideframes were removed, and a brass frame, using 6mm brass strip and brass tubing, fabricated for each side. These were then fitted to each bogie. The original Athearn wheels, which are notorious for getting dirty, were replaced with Bachmann plain disc wagon wheels, which are just about the right size. Although the Athearn bogies have the correct off-centre wheelbase for the 001 Class, the sideframes supplied with the kit do not. However, the difference is not too noticeable, and, despite the fact that I have a ‘thing’ about axleboxes not lining up with axles, I can live with the discrepancy. The sideframes were then tidied up, and bits that should not be there were removed. More bits made from plasticard will be added later, once the mechanical part of construction is fully finished, and the cosmetic part of construction is under way. The sideframes were then temporarily fitted to one bogie with double sided tape, the frame marked, and which has yet to be trimmed to shape. The chassis was then assembled, the motor being placed in a bed of silicon sealer using bits of plasticard under the flywheels to support the motor with about 1mm of silicon under it, until the silicon cures. This provides a good solid rubber mounting for the motor, and absorbs any vibration from it. If needs be, the motor can be easily removed at a later date, and refitted with fresh silicon. Any excess silicon can be removed by cutting with a craft knife. The motor is from an unknown Bachmann loco. The driveshafts are Athearn, with one end fitted with the end of a Bachmann driveshaft. The chassis was then fitted with some flat steel strip from B&Q for weight. This was cut to length and screwed in place. Countersunk screws had to be used as the sides of the chassis were a snug fit inside the loco body. Due to the width of the motor, there was only enough clearance for a single strip each side, but at the ends, clearances allowed a double thickness. The extra steel strips were fixed in place with superglue. Finally, the chassis was fitted with a 21 pin circuit board from a Bachmann locomotive, and a speaker in a suitably modified enclosure. The chassis was tested on DC, without a decoder, on a rolling road, and performed well with no excessive noise. The following road test on DCC was also very good, and the chassis (not yet fitted with couplings) propelled seven coaches up a 1 in 75 gradient with ease. It also traversed complex pointwork without any hesitation. More weight will be added once the underfloor fittings are in place, as I will fill the space in between with a solid lead block. Then we will see what it’s maximum hauling power is. Quote Link to comment Share on other sites More sharing options...
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