|
The new 35 & 15 T gears arrived yesterday... there's really not a lot of meat on them
The best I can come up with so far is to take a little of the height off the boss of the larger gear, glue/press the boss of the small gear into that, bore the centre out to 5mm, then make spacers to control the sideways position in the gearbox. |
Please Log in to join the conversation. |
|
Thanks eddrick - I seem to have ended up with two original Holiday Buggys & two Sand Rovers (as well as a re-re of each, I'm not quite sure how that happened ), IIRC one of each has the 380 setup & the others are 540's, so I don't really need any motor fittings Re the tailstock, looking at the Unimat manual (which the thing is a clone of), + the photos it looks like the tailstock "should" be assembled with a 3.5mm collet, collar & pin spike ... but I can't see any reason why I couldn't put any one of the other different size collets in there (1, 2, 2.5, 3, 3.5, 4, 5 & 6mm) & an appropriate size drill bit in it ... this seems so obvious to me I don't know why it's not shown as a feature |
Please Log in to join the conversation. |
Other option is to get a chuck with a plain spindle, & use your tailstock collet chuck to grip that spindle. - I'm actually looking at something similar for my mill, & have to warn you that so far I haven't managed to find a tiddly keyless chuck that ISN'T absolute cowpat! I'm currently looking into how good the Proxxon keyless chuck is, with a view to making a spindle to suit it (They come as just the chuck, without spindle), then I'll move on to looking at the Dremel version.
Collet chucks are ok, but they've only got a limited gripping range for a given size (Usually). Thinking about the motor bracket, er, didn't you supply me with the details to draw it? Yes, the SRB final gear is 0.6m (As is the spur/pinion), so that must be what I hacked up for the XR311! (Used spurs on my F2)
Custom F2
...
Hilux crossmember drawing
...
F2 axle drawing
...
Quattro radio lid
...
Holiday Buggy motor bracket drawing
...
Quattro resto
...
HitnMiss engine
...
Wild Willy resto
...
Mardave Cobra resto
...
Thunder Dragon resto
...
Grasshopper resto
...
XR311 resto
...
Modded XR311
...
Carbon 25th scratch build
|
|
Please Log in to join the conversation. |
|
The distance between centres is pretty small (I'm guessing about 125mm) ... I'd like to stock up on cutting tools & nylon bar too, but I think I'll wait for the thing to turn up - according to Hobbyking, airmail will take 7 to 45 (! ) days
|
Please Log in to join the conversation. |
Directplastics online for plastic bar (They deal with privateers)
rdgtools.co.uk for small tooling, chronos engineering are helpful too. If you're just gonna be chopping up fairly soft stuff, high speed steel is fine - comes in cheap bars, will happily do up to mild steel & is easy to grind to the tool shape you want with a normal bench grinder. Brazed carbide tipped tools are also really cheap & should last forever on soft stuff, (Will do stainless ok) but they're difficult to re-grind when dull. Don't bother with indexible carbide tooling, you're unlikely to ever need it (Will do really hard stuff) & tips are expensive. Might be worth looking at RDG's brazed carbide lathe tool sets, I think they do one small enough for Unimat - check the distance from the bottom of your toolholder to centreline of chuck, this is the maximum tool height/thickness you can have without a lot of grinding back. Lees than is ok, you just put beercan packers under the tool to get the centre height right
Custom F2
...
Hilux crossmember drawing
...
F2 axle drawing
...
Quattro radio lid
...
Holiday Buggy motor bracket drawing
...
Quattro resto
...
HitnMiss engine
...
Wild Willy resto
...
Mardave Cobra resto
...
Thunder Dragon resto
...
Grasshopper resto
...
XR311 resto
...
Modded XR311
...
Carbon 25th scratch build
|
|
Please Log in to join the conversation. |
|
Thanks eddrick - even if websites where you have to register & fill your basket up before they'll tell you what the postage will be really wind me up ...
I was leaning towards Nylon 6-6, but seeing that prices for Nylon 6 are about 25% lower, I'm wondering if the lower melt point is really a problem ... I mean, if anything is getting to 200 degrees C, then I'm in trouble anyway |
Please Log in to join the conversation.
Last edit: by Jonny Retro.
|
What are you doing with nylon? Would a different material be better anyway? (Nylon can be a pig to machine & get a good finish)
Custom F2
...
Hilux crossmember drawing
...
F2 axle drawing
...
Quattro radio lid
...
Holiday Buggy motor bracket drawing
...
Quattro resto
...
HitnMiss engine
...
Wild Willy resto
...
Mardave Cobra resto
...
Thunder Dragon resto
...
Grasshopper resto
...
XR311 resto
...
Modded XR311
...
Carbon 25th scratch build
|
|
Please Log in to join the conversation. |
|
Spotted a used set of gears on eBay:
|
Please Log in to join the conversation. |
|
Another (cleaner) set from the same seller:
|
Please Log in to join the conversation. |
It'll be interesting to see what they go for, there can't be many good sets left
Custom F2
...
Hilux crossmember drawing
...
F2 axle drawing
...
Quattro radio lid
...
Holiday Buggy motor bracket drawing
...
Quattro resto
...
HitnMiss engine
...
Wild Willy resto
...
Mardave Cobra resto
...
Thunder Dragon resto
...
Grasshopper resto
...
XR311 resto
...
Modded XR311
...
Carbon 25th scratch build
|
|
Please Log in to join the conversation. |