Jun 19, 2020 06:41
3 yrs ago
23 viewers *
English term
2, 1-½ or 3/4 inch pitch
English to French
Tech/Engineering
Construction / Civil Engineering
Calcul de pente
Je cherche la formule de conversion de cette mesure en unité métrique
Proposed translations
(French)
| 5 +1 | 1 inch = 2.54 mm |
Tony M
|
References
| pitches |
Johannes Gleim
|
Votes to reclassify question as PRO/non-PRO:
Non-PRO (2): Tony M, GILLES MEUNIER
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Proposed translations
+1
12 mins
Selected
1 inch = 2.54 mm
Though for soemthing like 'pitch' (= slope?), and depdnding on whether these are 'standard' dimensions, you may want to round those to 50 / 38 / 19 mm
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Note added at 14 mins (2020-06-19 06:56:50 GMT)
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Ah, I see: you want to know why the pitch is expressed this way!
"Minimum Pipe Slope
As a general rule, the recommended slope for most plumbing pipes is 1/4 inch vertical drop over every 1 horizontal foot, or about 2 percent. Pipes with a diameter of 4 inches or greater can have a slope of 1/8 inch per foot downhill from the source."
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Note added at 15 mins (2020-06-19 06:57:51 GMT)
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Inch per foot [in/ft] - Angle - unit converter ... CALCULAND
www.calculand.com › unit-converter
Conversion of units of measurement from physics and maths, e.g. Angle - Inch per foot [in/ft]
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Note added at 18 mins (2020-06-19 07:00:38 GMT)
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2" ≈ 17%
1" = 12.5%
¾" = 6.25%
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Note added at 20 mins (2020-06-19 07:02:44 GMT)
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In the UK, for the slope on roads etc. we used to say "1:16" or "1 in 16", which expressed the ratio independently of any actual units.
Railways express their much lower grades in a different way — I'm not sure, but I think it is possibly inches / mile?
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Note added at 31 mins (2020-06-19 07:13:06 GMT)
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Sorry, Antoine, but your request was far from 'limpide'!
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Note added at 35 mins (2020-06-19 07:17:16 GMT)
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On multiplie par 8,33333...
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Note added at 37 mins (2020-06-19 07:19:33 GMT)
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1 ÷ 12 puis × 100
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Note added at 38 mins (2020-06-19 07:20:49 GMT)
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It isn't possible to edit an answer, but you can correct the glossary entry afterwards.
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Note added at 14 mins (2020-06-19 06:56:50 GMT)
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Ah, I see: you want to know why the pitch is expressed this way!
"Minimum Pipe Slope
As a general rule, the recommended slope for most plumbing pipes is 1/4 inch vertical drop over every 1 horizontal foot, or about 2 percent. Pipes with a diameter of 4 inches or greater can have a slope of 1/8 inch per foot downhill from the source."
--------------------------------------------------
Note added at 15 mins (2020-06-19 06:57:51 GMT)
--------------------------------------------------
Inch per foot [in/ft] - Angle - unit converter ... CALCULAND
www.calculand.com › unit-converter
Conversion of units of measurement from physics and maths, e.g. Angle - Inch per foot [in/ft]
--------------------------------------------------
Note added at 18 mins (2020-06-19 07:00:38 GMT)
--------------------------------------------------
2" ≈ 17%
1" = 12.5%
¾" = 6.25%
--------------------------------------------------
Note added at 20 mins (2020-06-19 07:02:44 GMT)
--------------------------------------------------
In the UK, for the slope on roads etc. we used to say "1:16" or "1 in 16", which expressed the ratio independently of any actual units.
Railways express their much lower grades in a different way — I'm not sure, but I think it is possibly inches / mile?
--------------------------------------------------
Note added at 31 mins (2020-06-19 07:13:06 GMT)
--------------------------------------------------
Sorry, Antoine, but your request was far from 'limpide'!
--------------------------------------------------
Note added at 35 mins (2020-06-19 07:17:16 GMT)
--------------------------------------------------
On multiplie par 8,33333...
--------------------------------------------------
Note added at 37 mins (2020-06-19 07:19:33 GMT)
--------------------------------------------------
1 ÷ 12 puis × 100
--------------------------------------------------
Note added at 38 mins (2020-06-19 07:20:49 GMT)
--------------------------------------------------
It isn't possible to edit an answer, but you can correct the glossary entry afterwards.
Note from asker:
| Merci Tony, mais ma demande ne porte pas sur la conversion du pouce en valeur métrique mais sur la conversion de la valeur de pente (je pense que dans ce cas "pitch" est synonyme de "slope" en anglais US). En français la valeur de la pente est indiquée en centimètres de hauteur par mètre de longueur . |
| Thank you Tony, this is the answer to my question. Can you modify your answer in order I can grant you with the points after a 24 hours delay. |
| Thank you so much Tony |
Peer comment(s):
| agree |
Johannes Gleim
: I think, the question is correctly answered by 1 inch = 2.54 mm, but the asker was unsure how to apply, or whether European pitches are specified differently than UK pitches.
12 hrs
|
|
Danke, Johannes! In fact, this text is US — but Asker seemed in the end just to want the conversion factor.
|
4 KudoZ points awarded for this answer.
Comment: "Merci pour le site de conversions de données de mesure.
Je connaissais bien sûr le facteur de conversion de pouces en mm. Je ne savais par contre pas que la pente pouvait être exprimée de manière si concise (indication de la hauteur de chute mais pas de la longueur)"
Reference comments
13 hrs
Johannes Gleim
Works in field
40 years Engineer, 20 years translations
Native in: German
Works in: English to German, German to English, French to German, and 6 more.
Related KudoZ points
:
71
Reference:
pitches
If exposed thread is more than 3/4 inch, pitch control rod has been improperly adjusted.
https://books.google.de/books?id=hXs-AAAAYAAJ&pg=SA5-PA121&l...
Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.
Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly.
Fine Thread Series (UNF/UNRF) is commonly used in precision applications. Because of the larger tensile stress areas, they have high tension strength. However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping.
8 – Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. This series is used for diameters one inch and above.
https://www.portlandbolt.com/technical/thread-pitch-chart/
G-SERIES PIPE THREAD (BRITISH STANDARD PIPE PARALLEL was BSPP & BSPF)
PF-SERIES PIPE THREAD (JAPANESE PIPE PARALLEL)
British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
http://www.ring-plug-thread-gages.com/PDChart/G-series-Fine-...
1.4 PITCH/TPI:
The pitch is the distance from the crest of one thread to the next in mm.
TPI (Threads per inch) is used by inch thread
1.5 DIAMETER:
The major diameter is determined by the thread tips.
The minor diameter is determined by the groove of the thread.
The pitch diameter is the distance of two opposite flanks or the distance of the centreline of the profile.
:
NPT and NPTF appear to be identical. Both have the same pitch diameter at the top of the hole of the internal thread or end of the pipe on external threads and both have the same thread lengths or depths. However, there is a subtle difference in the root and crest diameters of the threads
:
Male thread
D (mm) - pitch (mm) - TPI (threads per inch) - BSP (BSPP & BSPT) - Metric fine - NPTUN/JIC/SAE (Thread class 2
https://www.teesing.com/files/en/brochures/Teesing-type-of-t...
(Compares metric and TPI pitches)
Lead /ˈliːd/ and pitch are closely related concepts. They can be confused because they are the same for most screws. Lead is the distance along the screw's axis that is covered by one complete rotation of the screw (360°). Pitch is the distance from the crest of one thread to the next. Because the vast majority of screw threadforms are single-start threadforms, their lead and pitch are the same. Single-start means that there is only one "ridge" wrapped around the cylinder of the screw's body. Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of one ridge. "Double-start" means that there are two "ridges" wrapped around the cylinder of the screw's body.[4] Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of two ridges.
https://en.wikipedia.org/wiki/Screw_thread#Lead,_pitch,_and_...
https://books.google.de/books?id=hXs-AAAAYAAJ&pg=SA5-PA121&l...
Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.
Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly.
Fine Thread Series (UNF/UNRF) is commonly used in precision applications. Because of the larger tensile stress areas, they have high tension strength. However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping.
8 – Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. This series is used for diameters one inch and above.
https://www.portlandbolt.com/technical/thread-pitch-chart/
G-SERIES PIPE THREAD (BRITISH STANDARD PIPE PARALLEL was BSPP & BSPF)
PF-SERIES PIPE THREAD (JAPANESE PIPE PARALLEL)
British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
http://www.ring-plug-thread-gages.com/PDChart/G-series-Fine-...
1.4 PITCH/TPI:
The pitch is the distance from the crest of one thread to the next in mm.
TPI (Threads per inch) is used by inch thread
1.5 DIAMETER:
The major diameter is determined by the thread tips.
The minor diameter is determined by the groove of the thread.
The pitch diameter is the distance of two opposite flanks or the distance of the centreline of the profile.
:
NPT and NPTF appear to be identical. Both have the same pitch diameter at the top of the hole of the internal thread or end of the pipe on external threads and both have the same thread lengths or depths. However, there is a subtle difference in the root and crest diameters of the threads
:
Male thread
D (mm) - pitch (mm) - TPI (threads per inch) - BSP (BSPP & BSPT) - Metric fine - NPTUN/JIC/SAE (Thread class 2
https://www.teesing.com/files/en/brochures/Teesing-type-of-t...
(Compares metric and TPI pitches)
Lead /ˈliːd/ and pitch are closely related concepts. They can be confused because they are the same for most screws. Lead is the distance along the screw's axis that is covered by one complete rotation of the screw (360°). Pitch is the distance from the crest of one thread to the next. Because the vast majority of screw threadforms are single-start threadforms, their lead and pitch are the same. Single-start means that there is only one "ridge" wrapped around the cylinder of the screw's body. Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of one ridge. "Double-start" means that there are two "ridges" wrapped around the cylinder of the screw's body.[4] Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of two ridges.
https://en.wikipedia.org/wiki/Screw_thread#Lead,_pitch,_and_...
Discussion
The term “pitch” and “slope” are often used interchangeably, which is incorrect. They do not mean the same thing. And slope provides more valuable information than pitch, as defined in this article.
https://www.nachi.org/roof-slope-pitch.htm#:~:text=The term ...