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Dave Jones 126/04/2011 18:52:52
85 forum posts
5 photos
Just one I have noticed this evening. The myhobbystore plans shows the centre of the cylinder bore being 1/8" from the top of the cylinder. Its not! it should read 1/4". The original shop notes are however correct.
Ill add anymore as I find them (hopefully not the hard way like this one!)
 
Regards,
Dave
 
Colin Jacobs 126/04/2011 19:28:26
69 forum posts
2 photos
Just like old Meccano plans they used to put mistakes in on purpose to see if the builder could overcome them and send in the corrections.
Dave Jones 127/04/2011 06:27:33
85 forum posts
5 photos
In that case, they can buy me another 5/8" square block of brass 7/8" length!! Unfortunately I found this one too late!
I was hoping for a nice tried and tested design, thinking that over the last approx 70 years the errors would have been corrected. Oh well, I've started so Ill finish!
On the plans, there is no indication on where the steam inlet is on the steam chest, from the construction notes it is "is made on the underside [of the valve chest], in the middle, and is 5/64 in diameter, or No. 48 drill."
John Olsen27/04/2011 06:45:32
1294 forum posts
108 photos
1 articles
The mistakes are probably not actually deliberate, but as you have just learned, they never ever get corrected. Or if there is any correction, it will be in a letter to the editor in a magazine 55 years ago.
 
regards
John
Sam Stones27/04/2011 07:38:20
avatar
922 forum posts
332 photos

To pick up on Colin Jacobs’ point.

Back in the 70's, I built my first computer from a kit of some 50 plus IC’s, which were to be soldered onto a large mother board. The retail outlet who sold the kit, had a standing offer of $25 to fix any problem (within reason), should the kit fail to work.

Perhaps not trusting my own soldering ability or that I preferred a neater solution, I elected to solder IC sockets to the mother board, and then to plug the relevant IC's into their respective positions. Unless I bent a contact pin during this latter step, I was fairly confident that none of the IC’s would become damaged or were over heated.

As I progressed through successive stages of the build, it was possible (using a CRO) to check the waveforms being generated. It was only during the final stages of the build that it became clear, something was not right.

Also, having built most of my brass skeleton clock by the time I started on this computer kit, I was heavily into using a 4" binocular magnifier. It was through my new-found `hawk-eye’ ability that I noticed a tiny gap in a single copper track. Although almost invisible to the naked eye, to say that the gap was conveniently placed for anyone to bridge it with a dab of solder would be an understatement.

$25 Hmmmm?

Or was it just my suspicious nature?
 
Regards,
 
Sam

Edited By Sam Stones on 27/04/2011 07:40:00

Dave Jones 104/05/2011 16:22:40
85 forum posts
5 photos
One more so far... The plans say the ports on the cylinder should be drilled 3/64" centres. No my friend, 9/64" as per the original articles.
 
Dave
 

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