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what does this mean on a drawing

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Dismaldunc15/11/2011 15:14:49
91 forum posts
8 photos
hi chaps just perusing the drawings that came with my german "bengs" stirling engine, I think the drawings have been translated into english as the wording is a bit dodgy, however there are lots of references to drilled holes ,borings etc that are written as 6H7. 4H7 10H7 and one PCD which is listed as LK17.
is H a wierd german decimal point?
 
thanks in advance
 
Duncan

The Merry Miller15/11/2011 15:30:44
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484 forum posts
97 photos

 
Hi Duncan,
 
6H7 etc are all references to classes of limits and fits extracted from the latest ISO documentation.
You need to consult a Machinery's handbook or suchlike to get the fuller picture.
Haven't a clue what the LK17 means!.
 
Len. P.
 
 
steve 115/11/2011 15:35:10
3 forum posts
hi there
the H7 applied to the holes are the codes for the type of fit required,These can be anything from a loose clearance fit to a very tight interference fit.The tolerances used are all in ISO-286.look at this link for a start.
 
http://www.roymech.co.uk/Useful_Tables/ISO_Tolerances/ISO_286_2s.html
 
no idea as to the LK17.
 
good luck steve c
Peter E15/11/2011 15:39:38
48 forum posts
22 photos
Hi Duncan,
 
You say that the drawings are german and then translated. Using Google translate I find that PCD in english = Lochkreis (hole circle) in german. and then the number tells the diameter in mm.
 
The "H" in the hole specs tells what fit it is. H7 is a close slide fit if I remember correctly and the number before is the hole size in diameter. So 10 H7 says a 10 mm hole with a close slide fit.
 
Hope this helps.
 
BR
 
/Peter
 
Edit: Just noticed that there were more than me answering at the same time   As was recommended above, look in the ISO specs for the correct fit for H7.

Edited By Peter E on 15/11/2011 15:41:44

GoCreate15/11/2011 15:41:11
avatar
387 forum posts
119 photos
Here is a useful tolerance chart
hole tolerance
S.D.L.15/11/2011 15:47:21
236 forum posts
37 photos
Posted by Duncan Jennings on 15/11/2011 15:14:49:
hi chaps just perusing the drawings that came with my german "bengs" stirling engine, I think the drawings have been translated into english as the wording is a bit dodgy, however there are lots of references to drilled holes ,borings etc that are written as 6H7. 4H7 10H7 and one PCD which is listed as LK17.
is H a wierd german decimal point?
 
thanks in advance
 
Duncan

6H7 means 6mm tole tolerance H7
 
This can be looked up here
 
 
Column down Left hand side is tol class H6 H7 etc actual tolerance changes with size so look across top and find range in 3-6 so tolerance is -0 + 8 um ie 6.000 to 6.008
 
ON the LK ref is the PCR or PCD 17mm?
 
Steve Larner

 
Dismaldunc15/11/2011 16:56:18
91 forum posts
8 photos
by gum that wuza rapid response thank chaps saved the day again!
Styx16/11/2011 08:09:04
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34 forum posts
42 photos
Hi Duncan,

I have just bought Kalle. Is this the same engine as you have? I have emailed the company asking for a set of English instructions but as yet have had no response.


Good luck with the build.


Steve....

Dismaldunc16/11/2011 08:52:36
91 forum posts
8 photos
hi steve, the engine i bought was the "Laura" the kit came with english (sort of) instructions. When I ordered it there was a drop down list of languages. I think the translation is software derived as although the words are correct the sense is not that clear. having said that there is only one sheet of words and the kit seems to come with enough bits to allow for my inevitable cock ups.
Let me know how you get on! Dunc

mgj16/11/2011 10:20:54
1017 forum posts
14 photos
Also you will find that reamers and the like are classed as Hx as well. The standard I think is an H5 IRRC, but you can get what you wan't - if you want to pay for it.
Jeff Dayman16/11/2011 12:25:26
2226 forum posts
47 photos
The LK in LK17 probably stands for "lochkreisdurchmesser" which means "hole circle diameter" in German. The 17 is likely 17 mm. I have seen this LK designation on various German drawings in industry.
 
JD
S.D.L.16/11/2011 19:26:29
236 forum posts
37 photos
Posted by mgj on 16/11/2011 10:20:54:
Also you will find that reamers and the like are classed as Hx as well. The standard I think is an H5 IRRC, but you can get what you wan't - if you want to pay for it.
 
I believe that Dormer and presto are normally H7 inline with the Din standard.
 
This page also tells you the tolerance on the reamer.
 
 
and here-for Dormer

 
Steve Larner

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