Search found 695 matches

by Julian Roberts
Sun Jul 14, 2019 4:43 am
Forum: Guest Book
Topic: N7 Chassis Question
Replies: 12
Views: 719

Re: N7 Chassis Question

Just to corroborate Philip's reply really but with my own perspective. I don't take anything on trust after my first P4 loco wouldn't go round a 4' bend having used P4 spacers. I work out the sideplay required for that radius with the versine, and the EM spacers are normally what I use now. ( For a ...
by Julian Roberts
Tue Jul 09, 2019 6:54 am
Forum: Chassis and Suspensions
Topic: Methods for Removable Loco Wheelsets.
Replies: 33
Views: 1463

Re: Methods for Removable Loco Wheelsets.

Third - and this was a major consideration – on small chassis, where the frames are not deep, sometimes no more than a few millimetres of material above the cut-outs, the lack of any bracing at the underside would seriously compromise strength. Compare a chassis to a saloon car turned upside down –...
by Julian Roberts
Tue Jul 09, 2019 6:23 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

Perhaps we may agree that our models fall into two categories? 1. Cameo sizes and a bit bigger, less than 10 turnouts, intended for close viewing where joggles may be visible. 2. Larger layouts, many turnouts, viewing generally more distant so joggles not unsightly. I think Paul that's exactly the ...
by Julian Roberts
Thu Jul 04, 2019 8:14 am
Forum: Chassis and Suspensions
Topic: Methods for Removable Loco Wheelsets.
Replies: 33
Views: 1463

Re: Methods for Removable Loco Wheelsets.

:lol: Paul. Absolutely agree re your suggestions. Many High Level kits have the csb option. However I was trying to imagine what Brian's starting point is and what the simplest way of adding suspension is. I guess a milled frame from Alan Gibson with hornblock slots and brake rod holes. To add compe...
by Julian Roberts
Wed Jul 03, 2019 9:14 pm
Forum: Chassis and Suspensions
Topic: Methods for Removable Loco Wheelsets.
Replies: 33
Views: 1463

Re: Methods for Removable Loco Wheelsets.

Brian, I fully concur with your desire to have removable wheelsets. With all respect to you that you may have a secret motive for having no suspension, I can't think of a reason, in P4 at least, for not having it, after all the work described above involved in making the wheelsets removable. It's ha...
by Julian Roberts
Fri Jun 21, 2019 9:12 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

Hi Dave I'm sorry I didn't see your post till now. But in fact I am not a convert to the devil, merely pretending to be! I am just experimenting with his works. But I have to say I did find it much easier making this turnout than my previous three with undercut blades. Most of it was made in one day...
by Julian Roberts
Wed Jun 19, 2019 1:08 pm
Forum: Track and Turnouts
Topic: Turnout construction - Question here please.
Replies: 115
Views: 16921

Re: Turnout construction - Question here please.

Hi Tony this is from your Brimsdown thread. If you have the inclination at any point to put the soldering iron down... but I'm not wanting to interrupt progress, no hurry for reply! I'm trying to work out if my eye is deceiving me - are some of the E switches curved on both roads? Hi Julian. I think...
by Julian Roberts
Sat Jun 15, 2019 8:14 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

I was going to illustrate completing the switch. Another turnout has taken priority. This is a Y turnout for the fiddleyard so function is the sole criteria. There is no attempt to conceal the joggles. Both roads have a slight bend at the set. I realised that the stockgauge needs to be slightly gaug...
by Julian Roberts
Fri Jun 14, 2019 9:55 am
Forum: Layouts and Operations
Topic: Brimsdown-The last grand project.
Replies: 287
Views: 36784

Re: Brimsdown-The last grand project.

:thumb Inspirational work and thread Tony. I'm trying to work out if my eye is deceiving me - are some of the E switches curved on both roads?
by Julian Roberts
Wed Jun 12, 2019 7:23 pm
Forum: Semaphore Signals
Topic: Signals for Hessle Haven
Replies: 23
Views: 3139

Re: Signals for Hessle Haven

:thumb thanks Keith! Would look impressive in P4 Mike....
by Julian Roberts
Wed Jun 12, 2019 4:17 pm
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 25
Views: 1746

Re: REF: Rail wheel profile and "to do" list update

Yes Paul possibly but access to layout is limited timewise and it's a lot easier to make from new at home than stoop over the layout fiddling around making tiny adjustments. (By the way this point was not the one featured in the video; I'm sure people realize that but just thought I should clarify.)
by Julian Roberts
Wed Jun 12, 2019 4:04 pm
Forum: Semaphore Signals
Topic: Signals for Hessle Haven
Replies: 23
Views: 3139

Re: Signals for Hessle Haven

Yes wonderful sights, thank you Mike. I was getting excited to see single semaphore signals still in use at Girvan on the line to Stranraer last Monday! In fact excited that there is still in this day and age a substantial line controlled entirely by semaphore signalling all the way there, with mann...
by Julian Roberts
Wed Jun 12, 2019 8:44 am
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 25
Views: 1746

Re: REF: Rail wheel profile and "to do" list update

Too late Dave I'm afraid! It was felt that other people had problems there too so was worth another go. Nothing wrong with the crossing however.
by Julian Roberts
Wed Jun 12, 2019 7:30 am
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 25
Views: 1746

Re: REF: Rail wheel profile and "to do" list update/weight matters!

I had the following written before I saw your post Will. Lots to think about there. From the current Snooze No 212 The Bardfield Chronicles 20190612_074126-1.jpg I think what my approach (disproportionately weighting the leading wheels) does is compensate for all-too-possible track imperfections. I ...
by Julian Roberts
Mon Jun 10, 2019 7:12 am
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 25
Views: 1746

Re: Weight matters!

Re my previous post of around April 25. Re Nadel's formula and Dave Bradwell's analysis, but correctly taking into account the added downward constant force due the vehicle weight, it is clear that rail climbing derailments are reduced by making the vehicle heavier, regardless of the suspension sys...
by Julian Roberts
Sun Jun 09, 2019 6:36 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

Thanks for the advice Dave and Martin - I will do that if I get into doing more Dave. But my next project is a fiddleyard turnout. I think pcb is a slightly underrated medium. This would have been a lot more faff with ply and rivet. Yes Martin I had forgotten for this print out but had a previous te...
by Julian Roberts
Sat Jun 08, 2019 7:19 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

The thread diverted to undercut blades, the alternative to joggled stockrails. I added the photo of two of my turnouts with undercut blades to the previous post. Now back to making a turnout with joggled stockrails as per the opening posts. In fact I'm just making the switch end of an existing turno...
by Julian Roberts
Thu Jun 06, 2019 8:20 pm
Forum: Track and Turnouts
Topic: Gauge widening with C&L plastic track
Replies: 4
Views: 349

Re: Gauge widening with C&L plastic track

I have a pair of the roller gauges supplied by C&L, which do not hold the rail tightly. These seem to be fine for constructing plain stright track with a correct TG measurement, but do not incrporate a gauge widening feature for curves. Many thanks, Liam Hi Liam C&L did do their roller gaug...
by Julian Roberts
Mon Jun 03, 2019 5:13 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails/ sideplay effect with undercut blade

Allan I'm glad Tony was able to be more helpful! - I should have said, most of what I know (via the internet as opposed to personal contact) comes also from him especially https://www.scalefour.org/forum/viewtopic.php?f=5&t=5727 Last drawing shows the sideplay of wheels on the diverging switch r...
by Julian Roberts
Mon Jun 03, 2019 8:35 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails/horizontal planing of undercut blade

" Surely the switch blades are not going to bear the whole weight of the wheel until the switch blade is wider than the wheel tread? Allan F Allan - most ideas I have on this subject (at least, via the Internet) come from Templot Real Track... http://templot.com/companion/real_track.php Screen...
by Julian Roberts
Sun Jun 02, 2019 9:21 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails/Undercut blade horizontal planing

How long is the blade of Dave Bradwell's drawing - is it an A, B, C....? Well, given that the extra slope towards the tips is 7 inches the drawing nearest equates to a B blade as far as I can work it out, using a vernier on the image on the screen. I thought I'd draw out the two types of horizontal ...
by Julian Roberts
Sat Jun 01, 2019 11:47 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails/undercut blade considerations

Dave (Bradwell) there are two gradients on the blade tip of your elevation drawing. How far below rail level is the tip of the blade on your drawing, how far is it till it is at full height and how far along does the first gradient end? Hi Julian, Here are some better quality scans. Bear in mind th...
by Julian Roberts
Thu May 30, 2019 9:01 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

Hi Julian, My sketch was intended to show that IF the tip is reduced to zero width at the gauging depth, then the gauge is unaffected and no joggle is needed. And that it can have a finite thickness below that depth in a practical model switch without affecting the measured track gauge. It wasn't i...
by Julian Roberts
Thu May 30, 2019 8:42 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails

zero_tip_end.png
zero_tip_end.png (29.24 KiB) Viewed 1002 times


Martin your sketch is showing an undercut switch with the top of the tip at the gauging line 18/32" below rail top level with an effective width of zero. Tony describes this tip top to be 23/32" below rail level.
by Julian Roberts
Wed May 29, 2019 7:18 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4121

Re: Joggled Stockrails/undercut blade considerations

The gauging point of 9/16" below rail level in Martin's diagram is 18/32" (scale 0.19mm). The reduced rail height described by Tony of 1/32" under 3/4" is 23/32" (scale 0.24mm). The difference is 5/32", scale 0.05mm, or 0.002". Tony has the rail height rising to f...

Go to advanced search