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Member postings for Chris_C

Here is a list of all the postings Chris_C has made in our forums. Click on a thread name to jump to the thread.

Thread: 1959 Nsu quickly
01/05/2019 19:54:10

I'd also get in touch with the NACC (their magazine is Buzzin' as mentioned above). They stock transfers, and list 3 different NSU ones at £3, £3.50 and £7 (no idea what or which a quickly would need, I'm a Cyclemaster person!)

Thread: Simple Vice Stop
21/10/2018 15:50:45

What a neat and (so it looks!) easy to make a design. Thanks Jason, I'll be making one of those in the next few days, the one that came with the miling vice on my machine just has an M6 tapped hole so you can wind a bolt in or out a bit. Fine, but as you say, anything that is narrower than 6mm (well, it's no against the fixed jaw, more like 9 mm) and you can't use it.

Edited By Chris_C on 21/10/2018 15:52:12

Thread: Turning a tapered carburator needle
16/10/2018 23:14:15

Another "they definitely aren't a taper" message here.

What might be useful is if you know/can find what letter code they are. Whilst the carbs may have been specially made, the needles may have been used elsewhere. (Granted, they also may not!)

A quick google search for "carburettor needle specification" brings up a book with tables as described by Howard above as the fifth link. It may be my lack of spelling ability in that search was key to the result

Thread: A little distracted from LBSC
31/08/2018 18:32:46
Posted by Jon palt on 30/08/2018 08:56:07:

....

I have been wondering if some of the difficulties encountered in making all the parts fit in the CAD environment revolves around the difference between being able to draw in 2D and 3D making all joints, mating surfaces and measurements fit exactly and the way in which some of LBSC's designs ended up being made with parts made "to fit" or "to measure" after the major assemblies had been manufactured from the "Words and Music"...

Whilst I'm not Dean and don't want to distract from his thread, yes, I think there is an awful lot of both of those problems. I've been drawing a 14xx in CAD, nominally starting with Martin Evans Dart, then modifying to John Smiths additions from ME a few years ago, along with a few changes I've added to ease of manufacture with the tools I have available. It's fair to say there is well over 1000 hours invested in the model now (I'm aware quite how much swarf could have been made in that time, but it's how my mind works)

Getting each set of holes matched for fastners to completely align is (nominally) critical in the 3D model. You can give tolerances, but it massively affects CPU time when you try to adjust any component (and I've aimed for user controls to adjust wheel rotation, brake, reverser, drain cocks, etc so that I can spot linkages fouling, Dart has a brake linkage crashing into the motion when in reverse problem as drawn). Most of these if you find a missing one when you are in the workshop, you'd just spot through. Angles/dimensions aren't always present on all faces as it's expected that the castings will be available so fully dimensioned drawings aren't given, just those of the important faces for the builder to machine. Bends in linkages that you would just tweak to fit in the workshop suddenly need a secondary geometric sketch to calculate the angles (although, I imagine I would do that to know the length of material to make them from in the first place, given most again list hole centre distances rather than "length of pre bent part".

I've mentioned to Dean previously that I have no idea how he gets through the 3D modelling at the rate he does, but it is great to watch! I agree, a website in some form would be ideal.

Thread: Classic Go Kart Chassis
04/03/2018 23:55:17

This club have been at the NEC Classic Car show the last few times I've been. I had a chat with one of the gents on the stand last year, but no further involvement than that

http://www.britishhistorickartclub.com/2016/

Thread: Start rite Mercury drilling machine
03/02/2018 19:13:15

Keyless chucks certainly exist in J33, I found a keyed Jacob's when I started stripping my Mercury on ebay, thanks to a saved search (the drill had been left in the garden with a 6" grinding wheel in the chuck on an arbor for lawnmower blade sharpening).

A few months later, the saved ebay search netted a keyless Rohm for 99p. It's the loveliest chuck I've ever been near, very silky action.

Thread: Budenberg Dead Weight Pressure Tester
26/01/2018 22:40:11

We have one at work, I've used it to drive pressure sensors in simulations. The one bit of advice I was given was to spin the weight to make sure the piston didn't stick, but I do wonder how much that is really required!

It's one of those things that has now become habit whenever I use the machine, so can't make an objective assessment!

Thread: "It" comes to life again
18/01/2018 13:06:47

Hi Dean,

I'm not used to Fusion, but use Inventor. If they are anything like similar, if you keep number of components in an assembly low, but use more nested assemblies, you make life easier for the program. I'll keep the links as text so as not to disturb your thread.

I have Stephensons working (2 versions in my case, as two authors have had a go, with reverser position and suspension height adjustable) and whilst the version in this video (**LINK**) doesn't have a huge number of components the assembly is now as per this photo (**LINK**) and it still runs fine. I do render the animations rather than run them in real time though, I wonder if that makes the difference?

For what its worth, my assembly tree (not sure of how that should be named) is roughly

  • Main Assembly
    • Frames with cylinders. tanks, bunker, smokebox
    • Axle
    • Crank axle
    • Pisons, rods, big ends
    • Valve assembly

That way, the program only has to deal with a few components during the animation phase, even if underneath the individual assemblies are complicated in themselves.

Really enjoying this and your previous locos, all the best!

Thread: Why do we never have great documentaries in the Uk that go into detail
30/09/2017 23:43:17

That was a most enjoyable half hour, thanks Mark. Even more so as Mrs C's profession is in languages, so gained more approval than the normal barrage of Mr Pete etc from Youtube!

From the rest of the discussion on programs in the UK, TV is very sparse of good in depth content and the lack of OU programs now seems to have reduced it further. Horizon and QED when I was growing up I enjoyed, though struggle to know if my knowledge has increased or the program now gives less detail. I do think (hope?) that those making the decisions for TV companies will see people leaving the standard broadcast channels for youtube specialist channels and hopefully start to commission more in depth programs.

Thread: Super-Fine Feed Change Gear for a Mini Lathe
19/02/2017 18:28:09

Michael, these are 16 DP for an idea of size. Photos aren't great, not much light in the workshop so depth of field is a bit shallow but it shows the required detail in certain areas. I've added high res versions so they can be zoomed into.

High res link: **LINK**

This one shows the lack of wear on the teeth given the use. Its sharp enough to see the tooth profile at the top of the gear by the cast one.

High res link: **LINK**

The test is just visible in that, though it didn't come out super well in real life either, but it lists tooth count, dp and pressure angle.

High res: **LINK**

The machine that made them is an Objet 30 Pro by Stratasys (**LINK**), so rather than material being a plastic filament melted and positioned by a CNC head, resin is deposited much like an ink jet printer and cured with a U.V lamp. I imagine there must be companies offering the services of machines of this kind, but as I have access to it haven't looked into them I'm afraid.

Hopefully there is enough sharpness to show the tooth profiles in the high res photos.

Neil, it you think it would be of interest to people then certainly, I can do some better photos with natural light.

19/02/2017 17:12:04

Neil, I believe I had a very quick chat with you about 3d printed changewheels at the Brooklands show last year. As it was a very quick chat indeed and as everyone else here wasn't around, the main point is that I have a 3D printed changewheel that has been in the gear train for just over 2 years being used as a fine feed and shows no signs of wear.

The downside is that it is not an extruded material print, it is a UV cure resin as I have access to that printer, but the involute profile is very good indeed.

At the time I had restored a 1930's Ideal flat belt lathe and had a list of missing changewheels from my set, so I printed those and a 63 tooth (which is the one shown in the below photo and youtube link) with the view of getting them cut from cast blanks. A parameterised model was made which takes DP, tooth count, wheel thickness, bore and keyway size so by editing each of those the set was made and being printed within 10 minutes of finishing the model. No finishing of any kind was needed, all gears fitted onto the lathe and mesh well as printed. They have been such a success that I no longer intend to replace them, even gear oil on the rest of the train doesn't seem to have worried them.

Happy to get some better close photos of them if there is any interest

https://www.youtube.com/watch?v=dvSWuGHL9W0

Thread: Model Engineer Issue 4542 (2 Sept)
17/12/2016 18:12:41

Thanks to a kind person on this forum I've now got a copy of the magazine, the above request is filled.

11/12/2016 23:05:44

Hi All,

If anyone does have a spare copy, I've only just reailsed I'm missing mine (also Hampshire, but I generally create a pile over the summer and catch up when the evenings draw in!)

I've spoken to Diane but there are currently no spares in house, does anyone who doesn't normally collect their issues still have one around?

Many thanks

Chris

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