I went to a 3D printing show with a Scott owning friend a couple of months ago to look at the possibilities of using 3D printed models as part of the casting process for development work with Scott barrels and pistons. It was his idea, not mine but it was fascinating. There are various different possibilities: you can make a 3D CAD drawing and then print a pattern from which you then set up to produce castings in a conventional manner, you could possibly print an exact replica of the component you want out of wax or something similar and then investment cast the item such as they do with jewellery. You can also print the actual sand cores, rather than printing the patterns from which to make them. You can use a 3D scanner, either handheld or one that rotates around the component, which will interpret the image into a 3D image from which a CAD file can be automatically produced. It was very interesting, but it got me thinking about how little I really know about casting.
Roger used to have patterns made regularly, not only for his Scott but also on a far larger scale in the context of the family-run, Leicester-based special purpose machine tool company, ‘Moss Machine Tools’, that he used to be works manager/ managing director for.
That company, details of which you can find if you click the link through to ‘Moss Engineering’ at the top of this page was involved in making complex machines for automotive, MOD and other sectors from 1947 to around 1991 when economic conditions forced it to cease trading. I don’t know whether he’s ever cast anything himself but he has significant understanding through having had to work with foundrys and pattern makers and seeing the issues that have to be overcome within those areas.
I realise that I’ve been looking at all this interesting technology to possibly assist within a casting process but I still haven’t any actual experience of casting of any type. I’ve worked with castings of course, and understand a little of the some of the areas that have to be considered; shrinkage, porosity, premature cooling, incomplete filling of cores but have found myself thinking about it more and more and have gone where any self respecting modern would-be self-improver goes to nowadays… You tube.
I’ve seen several casting videos recently but here’s one that I really liked by a guy called Keith Rucker, because of the thoroughness of the explanation of the process. he’s not setting himself up as an expert but he’s doing it and seeing where it could be better. He’s also using 3D printed patterns to make vintage components! I’m not likely to be attempting to cast any time soon, but it’s all part of learning the language and gaining a better understanding at how a pattern has to be made in order to be able to make up a successful set of core boxes and ultimately a successful casting.
Tommy Hatch came 3rd in the senior TT on a Scott on this year. The last time a Scott took such a high position in that event.
Tommy wasn’t riding the only Scott in this event and a couple of Scotts can be seen waiting for their turn to start.
In the last days I’ve been contacted by the new owners of both the Silk Scott prototype and ‘FNT’.
FNT went through a period of development which resulted in the fitment of one of the early Silk engines, Georges own, Scott based design. In the intervening years it was forced into boxes for a little while, but is now in deepest Wales and being rebuilt for use on the road. The owner confided that he had some sense of guilt about that, but the various racing focused parts will be retained for possible future use.
The Silk Scott prototype
It appears that the Silk Scott prototype machine is in Spain now and seems to have remained largely unchanged. The owners have a collection of all manner of period literature and photographs which document its previous life and the Manx GP race in the hands of Stuart Hicken, who is now part of the management of Mallory park.
The machine is for sale on ‘Car and Classic’ for £25,000. I’m not running a classified section, but I thought it was very interesting to see all the photos and documentation that they sent me and I thought that others may enjoy it too.
As well as the images, the owner also sent a number of scans of period reports of the Silk Scott’s TT adventure, as well as other relevant information.
Well, It has not been sitting in the corner of someones de-humidified workshop for 60 years with a dustcover on.
The cross slide and compound slide both had a bucketful of backlash, so I took them off last night to check out the leadscrews and nuts. I’ve stripped the cross slide completely and the leadscrew was pretty badly worn, with some damage which actually chased out the brass nut. Amazingly I just found one on ebay(!) and snapped it up. I haven’t stripped the compound slide yet but I’ll probably do it tonight.
The next thing to do is to take the saddle off and look at the underneath. Part of me really wants to strip the thing completely and have the bed re-ground, and scrape the saddle.. but that’s a reasonable amount of work.
Also I’ve found that the brass helical back gear drive from the main spindle is badly worn, but it might be ok. Wonder what the spares situation would be for that?
The more I look at this lathe, the more I like it. The details are superb.
A few extra bits of bracing on Sunday morning and a trip to Screwfix to buy a chain block and Sunday afternoon I lifted the lathe off the trailer! I did have to let the tyres down to get enough clearance to pull the trailer out but actually it all went perfectly. I borrowed some 1/2″ OD stainless rods that we’d had in an auction lot through work and dropped it onto those.
Once down I screwed an anchorage into the floor of the workshop and used the chain block again to drag it in, moving the rollers as necessary. It took a while but it’s now in position. Very satisfying.
I spent an hour or so last night cleaning, lubricating and inspecting it and can see there’s a bit of work necessary. There’s definitely wear on the tenons and the bed but I’m sure that I’ll be able to get it good enough for general work.
I’ve seen this countless times… Schwantz’s last minute braking manoeuvres. Wayne Rainey power wheelying up the inside into the corners. Racing on raw 500cc two strokes from the late eighties and beginning of the 1990s.
The virtual oily corkboard of a vintage motorcycle racing family