Search found 329 matches

by davebradwell
Thu Nov 26, 2020 8:52 pm
Forum: Wagons
Topic: Assembling Exactoscale wagon wheels.
Replies: 10
Views: 271

Re: Assembling Exactoscale wagon wheels.

The purpose of the gaps is to allow for possible variations in the length of the plastic sleeve so care is necessary if working from this. We do, however, have the advantage that we can check the sleeve before going ahead - obviously not possible when designing the tooling. Wobbly wheels are still t...
by davebradwell
Thu Nov 26, 2020 2:12 pm
Forum: Wagons
Topic: Assembling Exactoscale wagon wheels.
Replies: 10
Views: 271

Re: Assembling Exactoscale wagon wheels.

5 thou' is more than 0.1mm which is pretty close to 4 thou'. Why do you want to put washers in the gaps and which will prevent you getting equal pin-point protrusion each end?

DaveB
by davebradwell
Thu Nov 26, 2020 11:01 am
Forum: Wagons
Topic: Assembling Exactoscale wagon wheels.
Replies: 10
Views: 271

Re: Assembling Exactoscale wagon wheels.

The gaps don't have to be equal, just as long as you don't push the wheels up to the axle sleeve and expect the correct b-b. It's difficult to get these wheels to run true without the Exacto b-b gauge as you need to hold the axle perpendicular to the wheel due to the clearance in the hole. Just be s...
by davebradwell
Mon Nov 23, 2020 10:10 am
Forum: Track and Turnouts
Topic: common crossing vee angles
Replies: 33
Views: 1638

Re: common crossing vee angles

I agree completely, Terry, too much theorising and too many test planks. You can end up trying to build the perfect model and never getting anywhere. The first turnout you make won't be as good as the 20th so the sooner you start the better. Priorities change when you're building a complete layout. ...
by davebradwell
Sat Nov 21, 2020 8:41 pm
Forum: Other Workshop Practice
Topic: Heating the Workshop
Replies: 16
Views: 1054

Re: Heating the Workshop

You'll only get a suntan with UV so you're safe or disappointed, whatever your point of view.

DaveB
by davebradwell
Fri Nov 20, 2020 10:14 am
Forum: Steam Locomotives
Topic: Brassmasters Rebuilt Royal Scot, 46109
Replies: 84
Views: 9207

Re: Brassmasters Rebuilt Royal Scot, 46109

I started this earlier but it seems to answer your comment Dave. Assuming that here we are referring to the usual model fold along an etched line but if you change the geometry of a bend in any way, as in making it sharper, then it will not come out as the designer intended - or rather thought he in...
by davebradwell
Sun Nov 15, 2020 8:12 pm
Forum: Steam Locomotives
Topic: Another B1 chassis
Replies: 31
Views: 3726

Re: Another B1 chassis

With motion parts, it's possible to assemble the joints off the engine so that they are nice and free but when placed on the chassis perhaps the conn rod gets a slight twist or the radius rod is pulled to one side so there is instant friction. This is worse with forked joints or when just trying to ...
by davebradwell
Sun Nov 15, 2020 7:52 pm
Forum: Other Workshop Practice
Topic: Heating the Workshop
Replies: 16
Views: 1054

Re: Heating the Workshop

My reason for suggesting supplementary heating was to avoid a time when there's no possibility of heat - a sort of warmer frost-stat, if you like. Of course some thermostats have this facility but I feel it needs to be a bit warmer than frost protection. My workshop is currently at about 12 deg so I...
by davebradwell
Sun Nov 15, 2020 5:36 pm
Forum: Other Workshop Practice
Topic: Heating the Workshop
Replies: 16
Views: 1054

Re: Heating the Workshop

That seems very sound with the radiant heater potentially making you comfortable very quickly. Might I suggest you add a small convector heater with thermostat set to minimum at this time of year to prevent the structure getting too cold. This will improve your warm up time and reduce condensation/r...
by davebradwell
Sun Nov 15, 2020 5:14 pm
Forum: Steam Locomotives
Topic: Another B1 chassis
Replies: 31
Views: 3726

Re: Another B1 chassis

Return crank is most easily screwed on with final drive gear grubscrew released so wheels can turn - or motor with worm removed to achieve this. Wheels are rocked to and fro between front and back centres as crank is wound on. It's a bit tedious but there you are and there's no need to force anythin...
by davebradwell
Sun Nov 15, 2020 7:51 am
Forum: Steam Locomotives
Topic: Another B1 chassis
Replies: 31
Views: 3726

Re: Another B1 chassis

I'm out all day until dark so will look at solutions this evening. First thoughts are to eliminate the possiblility that the thing is tearing itself to pieces so check everything is free and there's no tight spots. I'm not convinced this is the case from previous postings.

DaveB
by davebradwell
Fri Nov 13, 2020 10:19 am
Forum: Where to Find?
Topic: Thin-walled brass tube
Replies: 10
Views: 1078

Re: Thin-walled brass tube

Yes, you should get accurate results and the only variation is in the bending so it's worth doing a test strip first to see if you've got it right for the way you do it - the strip from the edge of a fret is good for this. You should be able to mark out and drill holes for handrails, etc before bend...
by davebradwell
Wed Nov 11, 2020 5:49 pm
Forum: Where to Find?
Topic: Thin-walled brass tube
Replies: 10
Views: 1078

Re: Thin-walled brass tube

Yes, the difference will be exactly pi times 0.6 = 1.885mm. At work, the sheet metal drawing standard assumed a neutral axis 1/3 of the way through the material from the inside and this gave very good results even round multiple bends. I've used this in all my kit design. However, it all depends on ...
by davebradwell
Sun Nov 08, 2020 9:08 am
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 6077

Re: Little & Large - The Socially-Distanced Challenge

Full marks for having a go at making fancy wheels but it's troubling that the design of the form tool seems to waste 3 times as much material as you use - can't you grind off the LH side, possibly at an angle just to be more economical. I hope the new Society tools won't repeat this problem......or ...
by davebradwell
Sun Nov 08, 2020 9:06 am
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

You might slot out the hole in a couple of 2mm washers so they can be clipped onto the worm shaft to reduce the end-float without any risk to the running, Julian. Top tab is my favourite method of restraint but that will probably interfere with your ballast weight. As you say, if axle can rise, fall...
by davebradwell
Fri Nov 06, 2020 4:02 pm
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

It's possible, Julian, that some of the noise may be related to how you contain the endthrust of the worm which isn't visible in the gearbox photo. The bearings supporting the worm shaft should have their flanges towards the worm to give the greatest area and then pack between worm and bearing face ...
by davebradwell
Fri Nov 06, 2020 9:53 am
Forum: On My Workbench
Topic: Ralph's workbench
Replies: 36
Views: 5297

Re: Ralph's workbench

DougN, I can come up with an A4 drg of stations on the Pickering and Seamer Branch - try Wykeham, Forge Valley, etc. Looks similar but might not survive close study. There'll be something in the 3 vols of NER Architecture but it will take some finding.

DaveB
by davebradwell
Thu Nov 05, 2020 5:11 pm
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

Sorry, Julian, I missed your motor photo. Indeed the drive shaft is a very sound arrangement and it could never work with a single u/j although there are ways it can be done with the right kind of coupling. Can't see the gearbox restraint so will always be suspicious. Is it on a rubber pad to reduce...
by davebradwell
Thu Nov 05, 2020 5:02 pm
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

A thought, WillL. With 4-4-0 or 0-4-4 and fixed pivot on bogie might it be better to have a little sideplay on both coupled axles so they traverse in opposite directions on a curve so sharing the required offset between them? Certainly allowing play on the axle furthest from the bogie will reduce th...
by davebradwell
Thu Nov 05, 2020 4:06 pm
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

My current project has Gibson 6ft - 2in wheels. Front and rear needed a 0.3 washer each side and centre did without to give some sideplay, although this is rather excessive and I hope won't give trouble shorting on the rather complicated brakes. No wheels were harmed in the making of this model whic...
by davebradwell
Wed Nov 04, 2020 8:03 am
Forum: Steam Locomotives
Topic: Frame Spacing
Replies: 26
Views: 1725

Re: Frame Spacing

I believe a large gap between wheel and frame looks ugly and toy-like so have always considered the boss on the back of a wheel to be adjustable and irrelevent to frame width. It's easily filed. Have been using 16.2 over for years with axlebox flanges outside this. Most wheels need washers and every...
by davebradwell
Tue Nov 03, 2020 9:35 am
Forum: Guest Book
Topic: 0-6-0 CSB with one fixed axle
Replies: 10
Views: 1240

Re: 0-6-0 CSB with one fixed axle

if you want to assess the benefits of springing then you have to spring all the axles. If you have a fixed axle then the game's over and whether you spring or compensate the others it won't behave like the real deal, although, as has been said, the pick-up will probably be improved. The solution is ...
by davebradwell
Sun Nov 01, 2020 9:53 am
Forum: Track and Turnouts
Topic: Masokits etched chairs turnout construction
Replies: 29
Views: 3971

Re: Masokits etched chairs turnout construction

Yes Martin, I add on the gauge widening when choosing my drills to get the right check gauge. It's perhaps an odd way to do it but I go over the whole thing with vernier and drills after construction to see what I've ended up with. Thanks for confirming the check figure is constant.

DaveB
by davebradwell
Sun Nov 01, 2020 9:11 am
Forum: Track and Turnouts
Topic: Masokits etched chairs turnout construction
Replies: 29
Views: 3971

Re: Masokits etched chairs turnout construction

Drill shanks make useful gauges for things like check rails, Julian. A query for the experts - did the check gauge stay the same regardless of curvature or was there a check gauge narrowing to allow the wheeelset to lie at an angle? I can see there may well be sufficient clearance incorporated in th...
by davebradwell
Sat Oct 31, 2020 9:46 am
Forum: Tools and Techniques
Topic: Loctite
Replies: 7
Views: 1008

Re: Loctite

Well, my 20year old bottle won't stick anything and before that it could go off suddenly while the joint was being assembled. Will only buy another bottle when I have an immediate application. Biggest problem with the stuff isn't whether it sticks or not (that's usually pretty obvious) but where any...

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