Shopmade Chatter Tool

Andrew Hilton
2/12/1998

I must say that this isn't a tool that I have been anxiously awaiting to have.  It's not a critical tool for the woodturning that I've been doing and major surface treatments just aren't something I normally do ... yet.  Still, I had been mildly intrigued by doing some chatterwork on some of my smaller items and knew that this tool wouldn't be difficult to make myself.  I was right!

As many woodturners are all to familiar with, chatter is usually considered a problem that must be overcome instead of something we strive to intentionally make.  That terrible shriek of our gouges or scrapers skipping over the wood and causing those waves have to be fixed in our normal woodturning.  Wouldn't it be nice if that were the "in" thing to have on the inside walls of all our bowls?  And if we could reproduce that pattern every time we mean to as well?  So, what causes those chatter marks that we all so hate when it doesn't serve our purpose?  Basically, it means that either the wood or the tool is vibrating. The vibration causes the tool edge to touch the wood intermittently and cutting at those points.  The wood may be so thin that it starts to vibrate or maybe it's in the process of "moving" out of round.  The tool may be simply too small (thin diameter) for the job.  It maybe extended over the toolrest too far or any number of other reasons.  In these explanations lies how our chatter tool works.

The chatter tool is really just a very thin scraper. So thin, in fact, that it contacts the wood and flexes back off the wood.  This sets up a vibration where the flexible tip of the tool keeps hitting the wood, bending back and so on.  Each time it contacts the wood it scrapes just a little bit of the wood. This is what you see on the wood surface when the chatter tool is used.  Here are some of the variables affecting the effect you'll get with a chatter tool:

1) How thick the scraper is
2) The stiffness of the scraper
3) Shape of the tip
4) How far the tip is extended past the holder
5) What wood is used - or - the hardness of it
6) Lathe speed
7) Tool tip presentation to the surface of the wood
8) How fast the tool is pulled across the wood  

With all of these variables, you can achieve a huge range of possible effects.  Enough to probably say that you'll never get the exact same effect twice!  This creates a uniqueness that we often strive for in our woodturning.  At least a little bit of it.  This tool does take a bit of practice to use.  Just keep fiddling with these variables and you'll soon get it down pat.  Just don't blame me when you don't cringe at that high pitched shrieking sound when you're hollowing out that bowl so much the next time.  You might actually leave those chatter marks in there!  Skip to how to use the tool here.

Well, on with how to create my version of the shopmade chattertool.  Remember, use what you have laying around, if possible.  These things I had laying around.

DVC00001.JPG (57463 bytes) The basic components. A nut (used in case of problems ... see near the bottom), thumb screws, drill bit, automotive feeler gauges (thicker the better. Any kind of spring steel such as old jigsaw or reciprocating sawblades and even steel lawn rake "fingers" will work), handle which is optional but makes it look purdy (could be just tape or bicycle handlebar foam, etc.), and thin-walled conduit pipe (about any pipe will work here)
DVC00004.JPG (64365 bytes) Bend your spring steel so that the tips are bent down a little.  The feeler gauges I had were already like this but you can do it by just putting them in the vice or pliers and giving them a little bend
DVC00005.JPG (63269 bytes) Drill an appropriate sized hole for your thumbscrew.  Make it just a bit undersized so the thumbscrew will bite into the conduit and make a thread.  Note: conduit is pretty strong stuff and may strip your thumbscrew. If so, look much further below when I do just that and have to fix it.
DVC00008.JPG (56681 bytes) The handle I had just so happened to fit perfectly over the conduit.  A handle isn't really necessary but it looks nice and is easy to hold.  You could do just as well with tape or foam or just nothing. I had the handle so I used it.
DVC00009.JPG (56189 bytes) Tada!  Not done yet.
DVC00007.JPG (56776 bytes) You need something inside to hold you chattering spring steel against.  I just used a half piece of wood and glued it in there.
DVC00041.JPG (64685 bytes) I made the half round wood by simply rounding off some split-turnings blanks I had made up out of red oak.  Round it to size of the inside of the conduit and then split it apart again.  You could just as well round a solid piece of wood and then cut it (carefully) down the middle or sand it that way.  It doesn't have to be perfectly down the middle either.
DVC00040.JPG (62309 bytes) Here's a closeup.
DVC00073.JPG (62750 bytes) Put it in there and glue it down.
DVC00074.JPG (63303 bytes) Inside view.
DVC00010.JPG (56603 bytes) Done yet?  Nooooooooo.
DVC00011.JPG (58356 bytes) Gotta have that chattery thing that makes it all work!  Here's the view of a feeler gauge with the pointy end.
DVC00013.JPG (57103 bytes) Here's the other end (it's double ended!) of that feeler gauge but this time it's rounded.  Gives different effects when chattering.
DVC00012.JPG (56633 bytes) A side view showing the angle it's tipped down.   Doesn't have to be this much.
DVC00015.JPG (58889 bytes) How to shape the tips.  One of the secrets of a chatter tool is that you really do need that burr on the ends.  Just like a scraper needs one (usually), the chattertool needs one too.
DVC00014.JPG (59651 bytes) Rounded end.
DVC00075.JPG (74159 bytes) Here's a version made from an old jigsaw blade.  I just ground off the teeth and shaped the ends as well as bending them a little.
DVC00076.JPG (70087 bytes)  
DVC00077.JPG (72383 bytes) Doesn't that just look SEXY!?   Yeah, well, that's when you know you've been out in the shop too long.
DVC00085.JPG (64861 bytes) OOOooooppps!  The thumbscrew stripped out so I have to fix that.  The thumbscrew needs to really clamp down hard onto the chatter steel or it won't work.  First, I drilled a larger hole.  Large enough to hammer in a nut that will fit another (smaller in this case) thumbscrew.
DVC00086.JPG (65846 bytes) Hammer it in....
DVC00087.JPG (66190 bytes) So that it fits snuggly.
DVC00088.JPG (66942 bytes) When you have it the way you want it, epoxy it in place.  Or silver solder it in.  Whatever you want.
DVC00090.JPG (63100 bytes) The finished ... fixed ..... chattertool.  Let's get to chattering!
DVC00001_1.JPG (68869 bytes) Of course, you could just use some hand pliers or "locking pliers" like the Vise-Grip brand along with the springy steel mentioned above.  I only do this in a pinch (pun intended!) when I've either forgotten my chattertool; I got coaxed into demonstrating the chattertool when I wasn't supposed to be doing that; or some smart-ass suggests that it does just as well as a tool designed for the job....
DVC00002.JPG (67307 bytes) The reason I say the last thing above is because doing chatterwork with just some pliers ... even the locking pliers .... is even harder to do than with a tool handle made for the job.  See that curve on the pliers?  Almost every hand plier has some curve to it.  Yes, even the long-necked ones.  The problem with that curve (and it may not be a problem for those turners that don't care much what the chatter looks like) is that as you move your tool (the pliers in this case) along the toolrest, you've not only got everything else to worry about (see below), but now you have that curve to worry about.  It makes a bigger difference than you might think!  The slightest movement of that pliers' curve forward or backward on the toolrest makes a huge difference in what kind of chatter you get on the wood.  Do yourself a favor. Forget using pliers for this unless you have no other choice.  They're alright for demo'ing or if you have nothing else around but not if you want something to look good.
DVC00078.JPG (66058 bytes) Now, I've got to say that this takes a bit of practice to get it to work.  Hard wood, endgrain only (for the most part), a "skewed" angle and pushing fairly hard against the wood among other things make this work.  Just practice and move things around and you'll get the hang of it.  Start from the center and sweep outward.
DVC00079.JPG (66442 bytes) The angled chattering steel allows you to hold the tool pretty level. You still need to set the tool properly.  Hope you can see it in the pictures that follow.
DVC00081.JPG (62399 bytes) Rotate the tool to the left (counter-clockwise) so that the right side edge of the spring steel points to around the 1 or 2 o'clock position on a clockface.
DVC00080.JPG (65574 bytes) This is a "pulling" type of motion.  So, the tip that's going to contact the wood if further toward the center of the spinning wood than is the handle portion of the tool.
DVC00082.JPG (68350 bytes) Pull the tool tip from center to the outside as far as you want.  Make sure that your handle end of the tool is always "outside" of the tip of the tool.
DVC00083.JPG (62992 bytes) The chatterwork!  Click on the picture to see it up-close.  It's light-colored wood ... tough to see.
DVC00084.JPG (68351 bytes) It's clearer on this light wood (Maple) when you color it.  You can tell if it's working if you hear that squealing sound.  Otherwise, you're just making grooves... at best.

Here's some drawings I made so that maybe it's easier to see what's going on and how to hold it.


 


 

 

 

That's it!  The catalogs list this tool at around $40US.  I made this one out of about $3US of materials.  Not bad, eh?

 

 
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8/18/05 2:38:52 PM ... Fantastic explaination. Beats spending a load of money on something you can make yourself!
1/14/06 9:57:57 PM ... I think I will make my own now. Thanks very much for the information.
2/13/06 7:26:01 PM ... Looks GREAT!!! Can't wait to make it! Well written and excellent pics with no wasted BS.... My COMPLIMENTS!!! :)
7/27/06 11:43:34 AM ... Well done Andrew. I've made a few of these. Beats paying too much for something so simple
9/23/06 7:35:13 PM ... I can do that! Where was this teaching 15 years ago when I BOUGHT mine??
12/15/06 6:15:12 AM ... Others say the burr should be honed off the cutter. Anyone else got any experience?
12/30/06 12:12:15 PM ... Sure. The burr / hook can be taken completely off too. Gives a different, much smaller, chatter pattern. May not work at all on some woods either. Just give different things a try and see how it works with what you're working with.
2/7/07 4:32:55 AM ... OK. This is what you use. I had wondered for some time. Good job!
3/4/07 2:32:33 AM ... Well done. Good information guys. We here at the club know that you put a lot of work into giving out free articles and videos on your website without a lot of the BS on other sites. Helps us new turners out a lot!
3/4/07 9:02:12 AM ... I noticed that you had quite a different tool than the one pictured when you demo'd for us here in Georgia this past fall. Did you make that one too?
3/4/07 2:18:05 PM ... Made one of these myself and it works great! Followed your directions.
11/10/07 12:12:23 AM ... thanks!
5/30/08 3:25:47 PM ... Very well written, the pix all helped alot. The drawings at the end should answer anyones questions if they still have some. I will be making one this weekend. Thanks!!!
8/17/08 3:14:14 PM ... at what speed should the lathe be set ?
8/23/08 6:44:23 PM ... Like most of woodturning, it depends. Depends on what effect your wanting, stiffness of the tool, hardness of the wood, profile of the tool, and so on. For chatterwork, a slower speed will produce wider-spaced chatter marks easier to see in most cases. If pressed, I'd say 1000 rpm? Make a pass if it's not what you want sand it off and try some other speed.
10/12/08 11:55:26 AM ... Very many thanks, what a money saver and an ace tool as well. It has solved my problems of adding a different surface finish for small coloured items
11/16/09 8:16:17 PM ... Great Article. The photos and text are excellent and so complete. Thank you for sharing this.
12/15/09 6:43:34 AM ... i am a beginer.it is a very usfull article dr erlich david[m.d] [URL/EMAIL edited for protection]e_r_l_i_c_h_._d_u_d_i@gmail.com
12/17/09 4:01:57 AM ... Hi Andrew Thank you That is a very fine article well written with humour thrown in + excellent pictures and we all know a good picture speaks a 1000 words. Well done matey. Iv made one up and it works very well indeed. Hope you lot on the other side of the pond have a great Christmas. Best regards from Chalky in England
12/17/09 4:01:57 AM ... Thank you Chalky in England ! Chatter can be a wonderful thing in woodturning when you intend for it to happen, of course. Ha! And a very Merry Christmas to you and everyone else out there, too.
1/25/10 11:34:25 AM ... nice job. better than the $40 + shipping, they want on ebay
6/23/10 11:19:13 AM ... Hola: deseo elaborar juguetes mexicanos y esta herramienta es exelente para dar textura... Gracias *~* Rough Translation: Hi, wish to elaborate Mexican toys and this tool is excellent to give texture ... Thanks
7/14/10 6:29:51 AM ... Thank you.
8/26/10 4:24:06 PM ... Thanks Andrew...I'm going to make 2 of them...One for a friend. Keith from Ontario
11/16/10 1:05:22 AM ... is very good tool idea I like very much
4/18/11 7:21:49 PM ... lol... you just saved me a lot of money!!! thanks
6/1/11 5:56:54 AM ... Thank you very much, Sonny. I'm glad that I could help. These things are very easy to make (a bit tricky to use but not too bad) so I couldn't see anybody having to pay $30+ for a commercial one.
6/1/11 5:56:54 AM ... Very well written,and with the photos to help, I will make one in the morning. Thanks a lot for shareing, you are to be commended. Sonny ( a greenhorn)
1/11/12 8:42:11 AM ... AS A YORKSHIREMAN THANKS FOR YOUR MONEY SAVING IDEA.
6/3/12 9:39:54 AM ... Thank you, another tool to play with and add a new twist to topping boxes for me as a new turner.
11/18/12 5:52:08 PM ... About the Burr. I have been told both to remove the Burr as it tends to tear the wood and to leave it on. I imagine it has the same effect as the scraper. I just came across this article. I made basically the same tool using hardwood shaped into a handle, sawsall blade. and a hose clamp.
11/19/12 5:52:08 PM ... Yeah, you really do need the burr. Just not very big. If you're getting ugly tearout instead of chatter marks, you've either got too much burr or too soft of wood. There's lots of scraps around to make these tools, absolutely. It's up to your imagination and scrap-pile. Ha!
1/28/13 11:55:22 PM ... Just what I have been looking for.Many Thanks.Will pass on info.
3/14/13 8:12:41 AM ... Puuuuurfect! I am very glad I found this article. Have you other shop made tool ideas? I recently made a super thin parting tool from a B&D edge trimmer blade (tool steel). It does require frequent sharpening, but it cost about $8.00 plus the scrap wood handle and glue to secure it.
3/30/13 8:11:24 AM ... LOL I took an old 1/2 inch drive socket extension drilled out the retainer hole on the female end to 25/64ths and tapped it to 1/4-20. I didn't use the standard #7 drill for the pilot because the extension is pretty hard, take your time & use cutting oil if possible. A standard hacksaw blade or cut down saws-all blade fits perfectly in the female end. You can cut the male end off and add a wood handle, just make sure the extension is not of the tapered variety. The weight of the extension is a plus and changing the blade is easy as pie.

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