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David Clark 130/06/2011 10:33:06
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Hi Eric
The 0.02 is to allow for the thickness of the paint.
regards David
 
John Stevenson30/06/2011 10:48:41
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Posted by KWIL on 30/06/2011 10:15:45:
An error is an error, whatever the size!
 
 
Can you even measure that ?
 
On a long bed lathe the curvature of the earth is bigger than that.
 
John S.
David Clark 130/06/2011 11:01:52
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Hi John
Yes you can measure that.
I used to make components to those limits, they had to be withing that size and also flat to about that limit.
Then they threw them in a zinc plating vat.
I am sure that helped to retain the size.
regards David
 
JasonB30/06/2011 15:57:36
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Posted by David Clark 1 on 30/06/2011 10:33:06:
Hi Eric
The 0.02 is to allow for the thickness of the paint.
regards David
 
Problem is whoever drew it up only allowed for paint on one side as the width is 58.8 and the centre line is dimensioned as 29.42.
 
Its just poor conversions from imperial to metric compounded by rounding up and inconsistant working to different numbers of decimal places and significant figures
 
David any chance of sensible answers to all the other errors?
 
J

Edited By JasonB on 30/06/2011 15:58:16

David Clark 130/06/2011 19:17:11
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Hi Jason
The DXF files are imported into Illustrator.
Illustrator decides on its own dimension and sometimes adds or removes a tiny fraction of the measurement, hence the 0.02mm.
 
I missed the radius on the 38.5, it should be diameter.
The diameter sign on the 22.8 pad was added by the illustrator and I missed it.
 
Heights don't add up. 1.75 + 7 + 6 + unknown does not equal 13
Yes, something is wrong but 1.75 is irrelevant (oh for a spell checker)
 
Fig 8
Dimensions are correct, I have checked original. Just not to scale.
 
Fig 4
14.5 appears to be right
14.3 does not go to the edge of the pad.
 
Bore for cylinder liner is incorrect but same as the original.
 
Fig 12
3mm refers to the bar the thread is turned from
 
And where does one get 2.85mm silversteel and a reamer to suit?
Turn the silver steel down from 3mm diameter
 
Beam bearing holes are 1.75 from borrom.
1.75 is from fig 9 where they fit and holes are in line with the 1.75 dimension.
 
regards David
 
 
 
 
 
 
Steambuff30/06/2011 19:43:34
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David
 
What about JasonB's Darjeeling query ...
 
Darjeeling
Nut bottom right page 15. Shown as 3/16" long
Also says drill and tap 3/16" deep
Leaves nothing to drill the 3/32" hole into
 
Dave
 
JasonB30/06/2011 19:44:33
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Thanks
 
Fig 4
If thats the case then the lower edge of the water discharge pad should be lower than the top edge of the crank bracket pad but its drawn above it.
 
Fig 7
Any comments, I would expect the curve to be a quater circle, unfortunately this part has not been shown on the plan view of the jacket
 
Fig 12
But the dimension lines go to teh thread, the dia of the bar is drawn at 6mm proportionally to the rest of the drawing
 
Fig 10
If the beam bearing holes are 1.75mm from the bottom then we still need a dimension for the depth of the two recesses to be able to correctly position the axle horizontally
David Clark 130/06/2011 22:21:10
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Fig 4
If thats the case then the lower edge of the water discharge pad should be lower than the top edge of the crank bracket pad but its drawn above it.
Not on the original
 
Fig 7
Any comments, I would expect the curve to be a quater circle, unfortunately this part has not been shown on the plan view of the jacket
 
 
Fig 12
But the dimension lines go to teh thread, the dia of the bar is drawn at 6mm proportionally to the rest of the drawing
Yes, the illustrator got it wrong but the text on the drawing explains it.
 
Fig 10
If the beam bearing holes are 1.75mm from the bottom then we still need a dimension for the depth of the two recesses to be able to correctly position the axle horizontally
 
The recesses are in the other fig, and are 1.75 deep, the bit the bearings screw to.
JasonB01/07/2011 07:37:23
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Fig 12
Text does not explain it, It says 8BA x 3mm (assume 3mm length of thread) the plan view and end elevation clearly show that the larger dia of teh pin is substantially more than 3mm.
 
Fig 10
The 2.85mm hole centerline is not shown in line with the 1.75mm recess, it is clearly shown above it. Therefore we either need a height for the hole (PROBABLY 2MM) or the 1.75mm is not teh size of teh notches on teh bearing blocks.
 
Steambuff
Taking a guesstimate I would allow 1/32 to 3/64 at the end of the nut, unfortunately most of the other nuts on teh double page spread are not in proportion to the dimensions you you can't judge it from there. While looking at the nuts I also noticed the bore for nut top left of page 14 is also missing.
Bogstandard01/07/2011 08:19:58
263 forum posts
Jason,
 
It seems to be like a very well known casting and kit suppliers reply when you find out after many hours of previous work, there is not enough meat on the casting left to drill your latest hole into. I am talking about undersized or very close tolerance castings.
 
"If you are supposed to be a model engineer, then you should be able to sort it out yourself".
 
 
John
David Clark 101/07/2011 08:45:17
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3357 forum posts
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Hi Steam buff
It is correct to original drawing.
Just make it 1/16 longer.
It must go on the component at top left
so there is plenty of room.
 
 
regards David
David Clark 101/07/2011 08:52:16
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Fig 12
Text does not explain it, It says 8BA x 3mm (assume 3mm length of thread) the plan view and end elevation clearly show that the larger dia of teh pin is substantially more than 3mm.
On the original it is clearly shown as 3mm.
 
Fig 10
The 2.85mm hole centerline is not shown in line with the 1.75mm recess, it is clearly shown above it. Therefore we either need a height for the hole (PROBABLY 2MM) or the 1.75mm is not teh size of teh notches on teh bearing blocks.
On the original it is clearly shown in line with the 1.75 steps.
 
Steambuff
Taking a guesstimate I would allow 1/32 to 3/64 at the end of the nut, unfortunately most of the other nuts on teh double page spread are not in proportion to the dimensions you you can't judge it from there. While looking at the nuts I also noticed the bore for nut top left of page 14 is also missing.
The nut above has 1/16 at the end so use that on the lower nut by extending the length by 1/16in.
The bore for the nut top left is 5/32 as shown on the nut below.
 
David Clark 101/07/2011 08:54:48
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Hi There
We have an illustrator, not an engineering draughtsman.
He lives in Greece so comunication is not perfect and is often slow.
I am waiting for drawings at the moment and they go to press this afternoon.
I won't have a lot of time to check them.
Luckily they are mainly simple drawings without dimensions I think.
regards David
 
Versaboss01/07/2011 10:37:18
512 forum posts
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Posted by David Clark 1 on 01/07/2011 08:54:48:

We have an illustrator, not an engineering draughtsman.
He lives in Greece so comunication is not perfect and is often slow.

Ah fine, you support the Greek economy. It surely can use any little help it gets

Greetings, Hansrudolf

Engine Builder01/07/2011 16:22:00
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267 forum posts
How about this one.
Page 52 .A full page advert for the 2011 Model Engineer Exhibition.
No mention of what date it is on or where it is being held!
David Clark 101/07/2011 16:38:18
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3357 forum posts
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10 articles
Hi There
That was the wrong advert.
Someone used an incorrect partial design.
They are trying to change it for 4408.
Might be too late.
I suspect MEW 179 is wrong as well.
regards David
 
Nicholas Farr02/07/2011 09:20:03
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Posted by Engine Builder on 01/07/2011 16:22:00:
How about this one.
Page 52 .A full page advert for the 2011 Model Engineer Exhibition.
No mention of what date it is on or where it is being held!
 
 
But at least you you know it must be no earlyer than the 9th December.
 
Regards Nick.
Nicholas Farr02/07/2011 11:07:12
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3988 forum posts
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Posted by JasonB on 29/06/2011 17:04:31:
Darjeeling
Nut bottom right page 15
Shown as 3/16 long
Also says drill and tap 3/16" deep
Leaves nothing to drill teh 3/32" hole into

Posted by Steambuff on 30/06/2011 19:43:34:
David
 
What about JasonB's Darjeeling query ...
 
Darjeeling
Nut bottom right page 15. Shown as 3/16" long
Also says drill and tap 3/16" deep
Leaves nothing to drill the 3/32" hole into
 
Dave
 
 
I'd probably use the dimensions of the nut on page 14 top right hand.
 
Regards Nick.
Nicholas Farr02/07/2011 12:03:02
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3988 forum posts
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Posted by JasonB on 29/06/2011 16:54:51:
Bracket clock
 
Fig 14, overall thickness of gear shown as 0.125"
Thinner edge after chamfering 0.165"
 
J
 
In my mag, Fig 14 is the Ratchet Housing, and the 0.165 is the depth which the housing is bored to, nothing to do with the chamfering. The left hand dimension arrow is just on the wrong line for the 0.125 dimension, it should be on the next right hand line.
 
Regards Nick.
KWIL02/07/2011 12:09:47
3681 forum posts
70 photos
With all this attention to these drawings, may we look forward to an extra large number of these models being made? Somehow I doubt it.
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