Blog- Dave at Honley Tank's Blog - HONLEY TANK:- The Machine Tools Still Work!

RSS Fetcher · November 22, 2016

Hello again, Some juggling of domestic duties has led to my being able to find a regular weekly time spot for the workshop. Its a three hour break but, for useful modelling time it works out at perhaps 21/2 hours - remembering where you were when you finished last week, and tidying the bench at closure pinches valuable time. However, recently both the Boley lathe and the Myford have had their bearings warmed up! I have been in wheel-turning mode in the last few sessions, The Lima wheels of the Class101/2 DMU are all brass and, after a good dose of looking at, I decided that they could be skimmed to S4 thickness and I could then re-profile the tyres to Manchester (i,e. Sid Stubbs) profile. The un-insulated wheels are a good, firm fit on the knurled Lima axles and these I was able to skim while still on their original axle. However the profile tool involves forces above those that this method of holding could withstand and I was forced to make a special holding tool for this part of the whole process. After all the experimentation I ended up using the Boley and its step chuck to hold the wheel on its tyre for the skimming to <2mm thickness, and then to the Myford with the new holding tool for re-profiling the wheel flange. By now, I had discovered that the Lima wheel diameter was about 1mm less than the Gibson wagon wheels that I had intended to use as the insulated wheel - ( Lima use the 'American' system of pick-up on this model). This meant that I had to modify the insulted wheels too - i.e. twice as many wheels to machine than I originally thought! I've taken a few pictures along the way but as yet I've only processed these into my computer files, so perhaps a few more next time -: Here is the chucked wheel-holding tool. The orange marks indicate the section which should be under number 1 jaw of my three-jaw chuck. The clamping nut is made from the same MS rod as the main body and has flats at one end to suit a 2BA spanner. The screwed section is 8BA, mainly because 2.5 mm diameter will nicely accept an 8BA die and the wheel is made a tight, slide fit on plain 2.5mm silver steel. In short the tool is only two bits of 1/2" MS rod, both drilled through 2.5mm and tapped 8BA at their outer ends, the clamping nut having its inner-end inside diameter opened to 3mm for about 5mm. The threaded rod is 2.5mm silver steel, screwed and 'Loctited' into the main body. Sorry; could not get this without flash, which has produced a poor pic. It's supposed to show the wheel fitted with a tufnol bush which has just been drilled through on centre. The length that this bush protrudes on the wheel's inner side is later to be faced down to a length (0.080" if memory serves!) which minimises side-play of the axle so as not to allow the gears to un-mesh. a completed axle ready to slot into the Lima motorised bogie. And here it sits in the bogie ready meshed with the bogie's gearing system. That's all for now; TTFN Good modelling to you, Dave<div id='attach_wrap' class='rounded clearfix'>

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