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Search: Posts Made By: tjohnson
Forum: Talk To A Mechanic 12-13-2019, 08:02 PM
Replies: 231
Views: 7,382
Posted By tjohnson
This thread (and countless others) brings to mind...

This thread (and countless others) brings to mind something I, as a university professor, am very familiar with: Sayre's Law. Originally used to describe academic politics, it applies to many...
Forum: Talk To A Mechanic 08-10-2019, 03:29 AM
Replies: 8
Views: 2,273
Posted By tjohnson
That's like driving all the way around the...

That's like driving all the way around the world....22 times! That van needs to go into the Hall of Fame.
Forum: Talk To A Mechanic 06-22-2019, 08:07 AM
Replies: 73
Views: 3,406
Posted By tjohnson
If RKC has changed how he does something over the...

If RKC has changed how he does something over the years, to me, that is solid evidence that he is always trying to think of a better way to do it. Pool table mechanic? He experiments, refines,...
Forum: Talk To A Mechanic 06-19-2019, 12:37 PM
Replies: 25
Views: 1,591
Posted By tjohnson
I have an old GC1 that I have done a few repairs...

I have an old GC1 that I have done a few repairs on by myself (broken slate, stripped nut plates, etc.). Every single time I followed the generous advice of RKC on how to do the repair. Every single...
Forum: Talk To A Mechanic 06-07-2019, 05:28 AM
Replies: 4
Views: 2,605
Posted By tjohnson
I fixed my broken slate using RKC's soup can...

I fixed my broken slate using RKC's soup can method. Works flawlessly. And then you can have soup afterwards!
Forum: Talk To A Mechanic 06-06-2019, 04:15 AM
Replies: 2
Views: 2,647
Posted By tjohnson
Just speculating here but I would add to the...

Just speculating here but I would add to the above statement "as far as I could tell". Cracks in rock propagate over time. I suspect that a crack had long ago nucleated in your slate, and after 100...
Forum: Talk To A Mechanic 05-25-2019, 05:54 AM
Replies: 34
Views: 6,612
Posted By tjohnson
In my case, the following issues were clear...

In my case, the following issues were clear indication that I was dealing with incompetent installers:

1. Used a power drill to install rail bolts. On three of them, they had misaligned the bolt,...
Forum: Talk To A Mechanic 04-22-2019, 04:53 AM
Replies: 6
Views: 804
Posted By tjohnson
Yep, they'll break that way, too. depends on...

Yep, they'll break that way, too. depends on which way you bend it.

And now that I can actually see the rock up close, it's not slate. Looks like a coarser-grained type of metamorphic rock called...
Forum: Talk To A Mechanic 04-20-2019, 10:44 AM
Replies: 6
Views: 804
Posted By tjohnson
Those slabs are metamorphic rock, probably...

Those slabs are metamorphic rock, probably something close to slate. The lighter bands are layers that are slightly richer in feldspar and quartz (good job Trent!). The darker layers also have quartz...
Forum: Talk To A Mechanic 03-27-2019, 10:24 AM
Replies: 10
Views: 909
Posted By tjohnson
Thanks Geoff and RKC, makes perfect sense.

Thanks Geoff and RKC, makes perfect sense.
Forum: Talk To A Mechanic 03-27-2019, 03:32 AM
Replies: 10
Views: 909
Posted By tjohnson
RKC and Geoff, are there any disadvantages to...

RKC and Geoff, are there any disadvantages to having a subrail (on a GC like Geoff described, for instance) that has a tongue along its face that would fit into the cavity?
Forum: Talk To A Mechanic 10-12-2018, 05:40 AM
Replies: 21
Views: 1,508
Posted By tjohnson
Good news! Which bit did you end up using?

Good news! Which bit did you end up using?
Forum: Talk To A Mechanic 12-21-2017, 03:42 PM
Replies: 123
Views: 9,761
Posted By tjohnson
Thanks RKC makes perfect sense.

Thanks RKC makes perfect sense.
Forum: Talk To A Mechanic 12-18-2017, 07:24 AM
Replies: 123
Views: 9,761
Posted By tjohnson
Thanks RKC, that makes sense. So please forgive...

Thanks RKC, that makes sense. So please forgive my next question, which likely seems naive!

What exactly does the cloth relief accomplish? I know it's a good thing to have but since the rail is...
Forum: Talk To A Mechanic 12-15-2017, 10:41 AM
Replies: 123
Views: 9,761
Posted By tjohnson
Geoff, in your diagram, does the nose-height...

Geoff, in your diagram, does the nose-height measurement take into account the bed-cloth thickness?
Forum: Talk To A Mechanic 12-14-2017, 01:55 PM
Replies: 123
Views: 9,761
Posted By tjohnson
Thanks for the clarification. So to keep the 2"...

Thanks for the clarification. So to keep the 2" length constant, do you need to adjust the dimension that I have shown with the "?" in the attached diagram as the angle changes? I think I'm reading...
Forum: Talk To A Mechanic 12-14-2017, 09:56 AM
Replies: 123
Views: 9,761
Posted By tjohnson
Geoff, I had a question about one of the...

Geoff, I had a question about one of the dimensions on your drawing. Should the distance between the feather strip and the top edge of the subrail change with changing angles? Or is that a constant...
Forum: Talk To A Mechanic 12-13-2017, 05:21 AM
Replies: 123
Views: 9,761
Posted By tjohnson
Excellent! That makes perfect sense.

Excellent! That makes perfect sense.
Forum: Talk To A Mechanic 12-12-2017, 09:40 PM
Replies: 123
Views: 9,761
Posted By tjohnson
I'll venture a guess: nose height should be the...

I'll venture a guess: nose height should be the same (within a narrow range) regardless of subrail thickness. To achieve this constant nose height, subrail angles will need to be adjusted, depending...
Forum: Talk To A Mechanic 12-12-2017, 04:09 PM
Replies: 123
Views: 9,761
Posted By tjohnson
I like geometry so forgive me for chiming in! If...

I like geometry so forgive me for chiming in! If the subrail thickness increases or decreases, that would raise or lower the nose height by the same amount. To bring the nose height back to the...
Forum: Talk To A Mechanic 12-11-2017, 04:19 PM
Replies: 123
Views: 9,761
Posted By tjohnson
Thanks for the explanation, makes sense!

Thanks for the explanation, makes sense!
Forum: Talk To A Mechanic 12-11-2017, 01:09 PM
Replies: 123
Views: 9,761
Posted By tjohnson
Very interesting diagrams, thanks for posting...

Very interesting diagrams, thanks for posting these. I notice that the contact point in each case is a little lower than the nose height, and the difference between them is close in each case but not...
Forum: Talk To A Mechanic 08-09-2017, 07:02 PM
Replies: 33
Views: 6,090
Posted By tjohnson
Thanks for the photo. That looks like a thick...

Thanks for the photo. That looks like a thick light beam. I suspect it's a fast technique, but can't match a Starrett-leveled table.
Forum: Talk To A Mechanic 07-21-2017, 01:54 PM
Replies: 6
Views: 1,423
Posted By tjohnson
The laws of physics don't allow the ball to leave...

The laws of physics don't allow the ball to leave the rail at a speed that is faster than the speed at which it arrives (i.e. "accelerate"). Maybe the ball is "jumping" when it hits the rail which...
Forum: Talk To A Mechanic 07-09-2017, 06:15 AM
Replies: 33
Views: 6,090
Posted By tjohnson
Would it be possible to cut a narrow slot into...

Would it be possible to cut a narrow slot into the plastic pipe and use that as the mark instead of a black line? Then when the beam hits it, it just disappears into the pipe and won't reflect.
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