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Good articleBroaching (metalworking) has been listed as one of the Engineering and technology good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
Article milestones
June 8, 2010Good article nomineeListed


Why do History of Buddhism, 14th Lok Sabha and Nicolaus of Damascus link to here? I think we need a {{disambig}} page here. 21:50, 30 May 2005 (UTC)[reply]

Links fixed with broach occurences redirected to Bharuch, disambig created for brooch (jewellery). — Graibeardtalk Graibeard 06:32, 4 September 2005 (UTC)[reply]

Poor link[edit]

I have reverted the reference to the google articles page. The link goes to a search results page. The reader is then left to wade through multiple articles, many of which are not applicable. It's probably OK to cite a specific article; or better yet, summarize any worthy content.--gargoyle888 11:53, 12 April 2007 (UTC)[reply]

Wobble broach needs a picture?[edit]

I've handled rotary broaches (though I don't have one to photograph) and I'm still struggling to understand that section of the article. Would benefit greatly from an illustration or photo showing the relevant deatils! Myself248 08:43, 4 December 2007 (UTC)[reply]

Here is a diagram illustrating the rotary broaching process and an rendering of a hexagon rotary broach

HRotary Broaching Diagram Wobble Broach Tool

--Polygonbroaches (talk) 01:11, 26 October 2014 (UTC)[reply]

Rotary broaching is not a proper noun[edit]

"Rotary broaching" is not a proper noun. It refers to a class of broaches, not a single one. Please provide a source, otherwise I'm switching it back. For guidelines that pertain to this please see MOS:CAPS, Wikipedia:Proper names, and WP:V. Wizard191 (talk) 22:42, 15 June 2009 (UTC)[reply]

History notes for later workup[edit]

As of this writing, the history section says that broaching was applied to rifling after WWI. This occurred earlier according to Roe 1916:194. I also remember reading somewhere that one company in particular, the Lapointe company, played a huge role in the development of broaching practice, kind of like Norton with grinding. Roe 1916 mentions Lapointe only in passing, but somewhere I read more detail about this. Anyway, Google Books probably is the place to search more. I don't have time presently, but I'm recording my thoughts here for further workup later. — ¾-10 01:37, 30 October 2009 (UTC)[reply]

Update: I just idly revisited that Roe 1916 page and realized that Roe does not specify what was being broached. It may have been any of the cuts besides the rifling itself. Oh well, it is still true that someday I will see about finding and adding more history info. — ¾-10 22:42, 3 June 2010 (UTC)[reply]

Describe action of broaching in lede[edit]

The action of broaching a piece is not described in the lede, beyond specifying that the broach can be moved against the piece or vice versa. The action should be described immediately after "Broaching is a machining operation which uses a toothed tool, called a broach, to remove material." ᛭ LokiClock (talk) 21:44, 31 May 2010 (UTC)[reply]

I added a sentence. Thanks for the note. Wizard191 (talk) 16:37, 1 June 2010 (UTC)[reply]
I also contributed my bit to explaining/elaborating: "A broach is effectively a collection of single-point cutting tools arrayed in sequence, cutting one after the other; its cut is analogous to multiple passes of a shaper." I hope it has value. — ¾-10 00:36, 2 June 2010 (UTC)[reply]
The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.
GA passed and listed

GA Review[edit]

This review is transcluded from Talk:Broaching (metalworking)/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: SpinningSpark 18:34, 3 June 2010 (UTC)[reply]

First impression is a nice, solid article. I am busy tomorrow so you will probably not get a full review until the weekend. Two things immediately struck me on a brief read through. First of all, it is not clear, at least in the lede, what the machine motion is. I presume it is always linear like a shaping machine (but are other motions possible?) and that it is reciprocating but no cut takes place on the backstroke. This is only me guessing of course, I could easily be wrong. A diagram might help. Secondly, I have some issues with the formatting and derivation of some of the equations, but I will get to that later. I am also not convinced you are following WP:LEAD, but I reserve judgement on that one as I have not yet fully read the article. SpinningSpark 18:34, 3 June 2010 (UTC)[reply]

Thanks for the note. Defining the processes in the lead is somewhat tough because there's linear broaching and rotary broaching, which both operate under the same principle, but do it using two different motions. I'll see what I can do clarify it. Wizard191 (talk) 12:21, 4 June 2010 (UTC)[reply]
  • Lede
  • The broach is used in a broaching machine... Is this sentence meant to only apply to linear broaching? If so, something like "Linear broaches are used in a broaching machine..." would be better. on the other hand if it is meant to apply to both types, it should not be splitting the two sentences.
  • favorable to other processes seems an awkward phrase, suggest "favored over other processes".
  • The link to stamping needs disambiguation
  • broach is rotated and pressed should be "the broach..."
All done. Wizard191 (talk) 13:33, 7 June 2010 (UTC)[reply]
  • Process
  • The link to spline needs disambiguation
  • The whole description of internal broaching is difficult to grasp and would benefit from a diagram, or at least, reference to the drawing further down the article. It is implied that the tool is mounted vertically, but this is left to the reader to work out. "Pilot", "elevator" and "puller" only start to make sense after looking at the later diagram. placed on a spherical workholder designed to automatically align the workpiece completely unclear to me how it is meant to achieve that.
  • Usage
  • "Keyway" is linked for the second time here.
  • easily cost. "Easily" is superfluous here, MOS:OPED.
  • Broaching can also be used on harder materials, like stainless steel and titanium,[11] but it is tougher. Not sure what the intended meaning of "is tougher" is here. Is it "Broaching is more difficult on harder materials, like stainless steel and titanium,[11] but is still possible."?
  • Types
  • The information does not really work as a table. I think a bulleted list might work better;
  • By use; internal, or surface
  • By purpose; single, or combination
  • etc
  • costs can also be reduced."Also" is superfluous.
All done. Wizard191 (talk) 18:01, 7 June 2010 (UTC)[reply]
  • Surface broaches
  • Slot broaches are cut slots. Does this mean "Slot broaches are for cutting slots"?
  • when more than one slot needs to be machined, because the broach can produce both slots at the same time. "More than one" is not necessarily the same as two. How is this possible? the tool can only be in one slot at a time.
  • Spline wikilinked for the second time
All done. I added an image of a broached slot, so I hope that helps as well. Wizard191 (talk) 18:08, 7 June 2010 (UTC)[reply]
  • Internal broaches
  • Arbor requires disambiguation
  • This is cheaper to produce than a solid broach, especially if it will need to be replaced after wearing out. This is not logical, whether or not the tool is eventually replaced makes no difference to the cost of the tool. Possibly what is meant is that the high cost of the tool is more significant on large production runs where the tool may need to be frequently replaced. But even that is dubious, a small production run which only uses the tool for, say, half its possible life will have higher unit costs than a large production run where the full life of the tool is utilised. Perhaps just "They are designed to mount on an arbor and are cheaper to produce than a solid broach."
  • I accept in good faith that this is what the ref is saying but I am still not quite clear why this is cheaper in the long run. The implication seems to be that hollow broaches last longer.
  • They are similar to shell broaches in that they are a multi-piece construction. Do you perhaps mean "except that" instead of "in that"?
  • SpinningSpark 12:53, 8 June 2010 (UTC)[reply]
  • Nope it should be "in that", because a shell type broach is multiple pieces (an arbor and a shell broach). I also tried to explain the reasoning of the cost difference. Wizard191 (talk) 17:54, 8 June 2010 (UTC)[reply]
  • Design
  • other broaches is similar. Should be "are similar".
  • Markup of mathematical symbols is not consistent and not compliant with standard practice (see MOS:MATH. Symbols for variables and quantities are always in italics. Affixes are in an upright font unless they are themselves variables. For instance it is Lw, not Lw or Lw. When using the LaTex math markup there are several ways of achieving this, none of them particularly neat. I use the mathrm function. For example <math> L \mathrm w </math>. If the suffix is more than one character, curly brackets are required eg L \mathrm {RP}. The whole article needs reviewing for this.
  • The most important characteristic of a broach is its RPT. It is not explained why this is the most important characteristic, or even why there is a rise at all.
  • Here they are defined as... This is not a definition, it is merely naming the terms. Suggest deleting this phrase and placing the colon after "broach".
  • tf is zero. Always, or just most commonly? Why bother to define a symbol for it if it is always zero? Also, MOS:MATH recommends not starting a sentence with a math symbol.
  • forging is wikilinked for the second time
  • The exact depth depends on many factors, however. The change to using "depth" as a term is confusing. Either continue to use RPT, or first say what is meant by depth, e.g. "RPT is governed by by the depth of cut required per tooth which depends on several factors." then start a new sentence. This also gets rid of the ugly "however".
  • final dimension. Presumably the dimension after each tooth has cut is meant. 20 thou seems awfully small for the total cut.
    • Yes that is what is meant, however I'm not sure any better way to say it. And 20 thou is correct.
  • The hook (α) determines the primary rake angle. In the list of symbols it says hook angle is the same as rake angle so this would appear to be a superfluous statement.
  • For steel is should be "For steel, it is".
  • The paragraph on notching could usefully refer the reader to some of the photographs which appear to demonstrate these notches. This might require assigning figure numbers to the images.
    • Are you referring to the rotor-cut design? If so, I'm not sure I have an image of one.
  • I was referring to the small channels that can be seen in the teeth of the lede image and some of the images of the spline cutting broach. I am assuming that these are the notches mentioned in the text. If so, it would be helpful to the reader to refer them to the images in the notching paragraph. SpinningSpark 12:53, 8 June 2010 (UTC)[reply]
  • there are not multiple teeth with the same RPT. What does this mean? If it means that there are not multiple teeth with zero RPT it needs rewording, if not, then clarifying. Same confusing might apply to the previous mention of RPT in that paragraph. And another mention in the subsequent paragraph.
  • As far as I can tell within the accuracy of the drawing, the chip-breakers have a constant RPT equal to the RPT of the following teeth, so I am failing to understand the meaning of this sentence. SpinningSpark 12:53, 8 June 2010 (UTC)[reply]
  • Chip breakers are different than a "rotor-cut" circular broach or "double-cut" surface broach. I moved the sentence to a different section and removed the comparison to these designs to try and reduce the confusion. Wizard191 (talk) 17:54, 8 June 2010 (UTC)[reply]
  • Calculations
  • pitch is usually defined by the workpiece length This is not a definition, most especially as the relationship is stated to be only approximate. "The pitch is determined by..." would be better. It would also be helpful to explain why the pitch of teeth depends on the workpiece length at all.
  • number of roughing teeth. I am not following why the equation is stated in this way. The implication seems to be that the finishing and semi-finishing teeth have already been determined by other means.
  • There is a hidden assumption in all these calculations that the pitch is constant across all teeth and the RPT is constant across each section of teeth. It might be as well to explicitly state these assumptions for mathematical rigour.
  • L = LB − Lw . I don't understand why this is so or why there is a difference between the two setups. If the stroke stops after travelling the length of the broach, the final tooth has only jsut made contact with the near side of the workpiece and several teeth will not have yet touched the far side. Subtracting the length of the workpiece makes this worse, some teeth will not have entered the work at all.
  • Cutting time. This equation is not in SI units. I don't have a problem with that (although converting would also solve the problem) but because it isn't it needs to be fully explained. It only works if not only the speed is in ft/min, but also the length must be in inches and the answer comes out in minutes.
  • Broaching machine
  • Rotary broaching
  • ''lathes, screw machine or Swiss lathe should all be plural for consistency. Also, it might be worth stating specifically that there is no specific machine for rotary broaching, it is a broach tool used in a more general rotary machine, this is not at first obvious and needs some reading between the lines to divine.
  • Swiss lathe redirects to lathe. I have added an anchor point to the lathe article to make this a more useful redirect. Please check that I have redirected to the relevant part of the article.
  • ''The leading (cutting) edge of the broach has a contour matching the desired final shape and this leading edge of the tool is wider than the body. This sentence is confused and should probably be broken into two. Wider than the body, the body of what? And why?
  • Because the broach is titled on this angle the pocket in the tool. tilted is misspelt. Is it not the toolholder that has the pocket? This may need explaining.
Hrm...a picture would be really good now. Wizard191 (talk) 00:49, 8 June 2010 (UTC)[reply]
  • It is not clear why the tilt angle is needed
  • Formula. It needs to be stated that the formula only applies to the specific case of 1 degree tilt (or else make the formula more general). More importantly, the RHS does not come out in unit of a rate. The rate of rotation needs to appear there somewhere.

:Formula. The "times" symbol would work better with text quantities rather than a dot, or else change all the quantities to symbols.

Done. Wizard191 (talk) 00:49, 8 June 2010 (UTC)[reply]
  • References
  • Ref 5 is not too informative on where the link is going to take the reader. Short form references are really only used when a full reference appears in the bibliography. It would be better to give the next level heading up in the sites hierarchy as well in the title, "AstroBroach Machines: Principles of Operation" makes it much clearer what is being linked. Also, if you are going to use a cite template, {{citeweb}} is more appropriate here. This will allow "Anderson Tool & Engineering Co., Inc." to be cited as the publisher.
  • Also on ref 5, although it verifies the use of water soluble cutting fluids, it does not verify they are becoming more popular, only that they have some advantages. Non-commercial sources are always preferable if you can find them.
  • Ref 11 is a bare url. Similar comments on format as ref 5.
  • Ref 14, similar comments on format as ref 5.
  • Ref 21, similar comments on format as ref 5.
  • This is now easily a GA standard article and I am going to pass it. However, I recommend that the remaining outstanding comments continue to be worked on before submitting for any further reviews. SpinningSpark 14:13, 8 June 2010 (UTC)[reply]
The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.


This [1] has a lot of free images that might be able to help the article. Wizard191 (talk) 18:02, 8 June 2010 (UTC)[reply]


I am a rotary broach manufacturer and would like to help clear some of these questions up, including providing an image. However, I am new(rookie) to wikipedia editing, and need help. First, maybe I can create a diagram/image. Please let me know where to put it when it is done. Thanks, Peter Qchess (talk) 03:20, 1 July 2011 (UTC)[reply]

Answered at User talk:Qchess __ Just plain Bill (talk) 20:51, 1 July 2011 (UTC)[reply]

rasp analogy[edit]

first, thanks for nice article, second, may I suggest that for many people, an analogy to a rasp or file would help ? As I understand broaching, it is automated rasp action, except that the tool is designed to do a single pass thanks — Preceding unsigned comment added by (talk) 15:55, 7 July 2016 (UTC)[reply]

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