mike hughes Posted June 13, 2017 Share Posted June 13, 2017 Hello all I've done the artwork for an 0-4-0 loco chassis as rigid and wish to add an half etch line so the modeller can fit sprung hornblocks if so desired but don't know what size they would be? Any information would be much appreciated Michael Link to post Share on other sites More sharing options...
Guest Isambarduk Posted June 16, 2017 Share Posted June 16, 2017 (edited) In what scale? David Hello allI've done the artwork for an 0-4-0 loco chassis as rigid and wish to add an half etch line so the modeller can fit sprung hornblocks if so desired but don't know what size they would be? Any information would be much appreciatedMichael Edited June 16, 2017 by Isambarduk Link to post Share on other sites More sharing options...
hayfield Posted June 17, 2017 Share Posted June 17, 2017 (edited) Hello all I've done the artwork for an 0-4-0 loco chassis as rigid and wish to add an half etch line so the modeller can fit sprung hornblocks if so desired but don't know what size they would be? Any information would be much appreciated Michael Michael I obtained what I believe is a brass fret of hornblock guides which I guess is 7 mm, the external measurements are 14 mm square, the slot for the hornblocks are 3.5 mm x 11 mm, to me the slot looks too thin for 7 mm 3/16th axles, could be from a kit which uses 1/8th axles Edit The slots are for 1/8th axle hornblocks In what scale? David 7 mm stated under the title Edited June 17, 2017 by hayfield Link to post Share on other sites More sharing options...
mike hughes Posted June 17, 2017 Author Share Posted June 17, 2017 It's defiantly 7mm and the axles are 3/16" (class 06) Michael Link to post Share on other sites More sharing options...
Knuckles Posted July 7, 2017 Share Posted July 7, 2017 Just giving the thread a bump as I too would like to know cut out dims for exactly the same reason. I've made some 7mm rescales of 4mm engines and so far the axle hole sizes have been adjusted but the half 'etched' lines I'd like to add once we know suitable numbers. I say etched with quotations because the chassis is 3D printed. Link to post Share on other sites More sharing options...
jim.snowdon Posted July 7, 2017 Share Posted July 7, 2017 Most of the commercially available hornguides are flat on the frame side, so the cutout only needs to be as large as the dimensions of the bearing itself, plus an allowance for positioning tolerance and vertical movement. Largely on that basis, I made the cutouts in the Snowhill WD 2-8-0 10mm wide and 7.6mm from axle centre to top of cutout, I have also started using the Slaters cast brass hornguides, and from the notes that come with them, they advise a cutout 10.67mm wide and 7.25mm from axle centre to top. The castings actually measure 10.6mm across the flanges that are cast into the frame face. If I were designing a set of frame round these, what I would do is make one set of cutouts just wide enough to fit the casting, and increase the width of the others by a little to allow for positioning tolerances. Sensibly, the tight one corresponds to the middle axle, so that any tolerance build-up fro the rods is spread evenly either side. Jim Link to post Share on other sites More sharing options...
Knuckles Posted July 7, 2017 Share Posted July 7, 2017 Thanks Jim, that's awesome. I'm sure that'll help many people in time to come who readeth. Link to post Share on other sites More sharing options...
mike hughes Posted July 7, 2017 Author Share Posted July 7, 2017 I asked Dave at Roxey and he said 10mm wide and the distance above the hole 7.5 to 8mm Michael Link to post Share on other sites More sharing options...
Knuckles Posted July 7, 2017 Share Posted July 7, 2017 Suppose there is variance between firms, design and preference. Having it as high as 8mm would at least give more travel option if it is wanted and having the narrower widths would allow them to be opened out to either dimension. Link to post Share on other sites More sharing options...
mike hughes Posted July 9, 2017 Author Share Posted July 9, 2017 Yes, everyone would have a different preference to whose hornblocks they use. I decided for the drawing to be 10mm and 7.5 high from the centre. It's easier to take metal off than put it back on! Michael 1 Link to post Share on other sites More sharing options...
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