Tag Archives: shop

Gettin’ jiggy with it? – A Dreaded Dilemma

By   25 Feb 2014

There you are, humming right along on a rather repetitive operation, when you think, “You know, I could make a jig that would help speed this along.  But, I would have to stop doing this to actually make the jig, and I’ll be done soon enough this way.”  If you’ve been woodworking for any appreciable length of time, I am sure you have had this thought roll through your mind.  Professionals will all intone, “Make the Jig!”, while the hobbyists will cry, “I have limited space and no production schedule pressing me, so this way is just fine!”  And they both are right, but for different reasons.

As a professional woodshop, Doobly-Do Wood Works has considerably more space available, a production schedule that must be met and the need for quick, accurate repetition.  Yet, we still do this same cost-benefit analysis before we make a jig or a machine for our shop.  That last part is also the value analysis of any jig: Accuracy, Repeatability and Speed.  The cost analysis is:  Time, Space and Usage.

“Give me six hours to chop down a tree and I will spend the first four sharpening the axe.”  — Abraham Lincoln


Creating a (proper!) jig for an operation drives out variability in the resultant parts.  This makes for better glue-ups, tighter finished assemblies and overall higher quality products from your work.  Just as a novice learns to cut all the pieces of the same dimension from the same tablesaw set-up (for example) so the pieces are identical, a jig basically freezes that ‘set-up’ in time, so it can be used over and over again.


As with accuracy, the ability to do the same operation over and over again, the same way over and over again, is an often overlooked benefit to using jigs.  In a production woodshop, it is absolutely invaluable, but the weekend woodworking warrior can employ these same principles.  In fact, if you are producing anything on a regular basis, say for an Etsy shop or an Ebay shop or a flea market stall or a shopping mall kiosk, I would argue the hobbyist’s need for repeatability is identical to a production shop.


The weekend hobbyist has the luxury of time.  When one is making a project for themselves or their own home, it’ll get done when it gets done.  But attach a monetary incentive to the production and suddenly, “how fast can I produce how many,” becomes an all consuming question.  Even in personal projects, speed is valuable (even if misunderstood).  If you get this one done faster, how many other projects could you get done in your limited, valuable time?

But what will Accuracy, Repeatability and Speed cost you?


Assuming you don’t buy a jig from a manufacturer (ew!) and you have useable materials on hand, a jig will cost you time to design and build.  A jig isn’t intended to be a show piece, so form can be ignored for function and expediency, but it still takes time to build.  This means you aren’t working on the project you intended while you are building the jig.  But will the time saved making the remainder of the parts be worth the time spent making the jig?  The hobbyist must answer this for themselves, but for the production shop the answer is almost always a resounding, “Yes!”


A jig, once made, must be stored, and this means it will take up some amount of space, somewhere, in your shop.  If you are working in a basement or a garage workshop, real estate is at an insane premium.  But even if there is more space available like in a production woodshop, the business discipline against waste in all its forms makes the calculus the same.  The decision to make and store a jig, and therefore sacrifice the space the jig will use up, is also tied to the last cost, Usage.


The most important cost aspect of a jig is the question, “How often will I use this jig again in the future?”  If the part the jig makes will be regularly produced, then the space is well spent to make and store the jig.  If the jig is a single-use case, then there is no sense in storing the jig and it should be broken down back to scrap when the intended purpose is complete.  This means the Time factor becomes the controlling factor in the jig-making decision process.

Parting Shot…

If you do decide to spend the time and space to make a jig to perform an operation with fast, repeatable accuracy, give one last thought to the future usage of the jig.  Even a single-use jig could be worthwhile based on the decision factors enumerated above; however, if the jig is ‘one-and-done’ then I would suggest forgoing glue and just using screws during assembly.  The jig can then be broken down back to scrap when the operation is complete.


Visit our social media pages, including our videos on YouTube, to follow the projects that are under production at Doobly-Do Wood Works.

Mike @ Doobly-Do Wood Works

Gabriel Janka and the Hardest Tree in the World.

By   14 Jan 2014

What makes a hardwood a hardwood, a softwood a softwood, and are hardwoods actually harder than softwoods?

     Believe it or not, the terminology has nothing to do with the density of the wood fibers (hardness).  Hardwoods are simply those species that are deciduous trees, and softwoods are conifers (evergreens).  It’s just that simple. However, simple seems to rarely remain simple.  While it is GENERALLY true that hardwoods tend to be harder than softwoods, the actual hardness of the wood may not follow that tendency.  For example, remember those Balsa wood bridges we made in science class in middle school?  Balsa is a deciduous tree, and therefore a HARDWOOD, as is the softest known wood specie, Cuipo (aka BongoHameli or Macondo).  Yet, they are considerably softer than, say, the softwood Douglas Fir that constitutes your average 2×4.

How does one measure such a thing objectively?

     Around the turn of the last century, an Austrian-born emigrant named Gabriel Janka (1864-1932) was employed as a researcher for the Forest Products Lab of the US Department of Agriculture.  His task was to objectively and scientifically measure the hardness (and therefore, durability and structural quality) of the lumber products coming out of America’s forests in that day.  He came up with a methodology for testing samples of these wood species that allowed objective comparison.  Janka’s hardness test consists of an instrumented mechanical press driving a .444-inch steel sphere (ball bearing approximately the size of a .44 bullet) into the surface of a between 1- to 2-inch thick sample.  The amount of force required to press the sphere 1/2 its diameter into the sample’s surface is the Janka Hardness Rating.  Janka’s hardness test method was adopted as the industry standard in 1906, and is measured in units of pounds in the US, kilograms in Europe and Newtons in Australia.  Though, a rating is commonly referred to in a simple unit of Janka, i.e. “Cuipo is 22 Janka, Balsa is 100 Janka and Doug Fir is 660 Janka”.

Janka Hardness Test


     The hardness rating depends on the direction of the grain.  A hardness test on the face of a sample is called a side hardness rating, whereas a test on the end grain is called an end hardness rating.  Unless otherwise noted on a Janka hardness chart, it is assumed that a chart is side hardness.  Also, the hardness rating in the chart represents an average of a huge sample size for that particular species, to mitigate the variability of hardness within the trunk of the same tree, i.e. heartwood is harder than the “live edge” growth ring.  The standard deviation is unique for each specie’s sample set, but they all median around 20%, so the accepted rule of thumb is that a number from the Janka Hardess Chart is +/-20% for that specie.

“Great, you told me some scientific history.  What use is it?”

     The straight Janka Hardness Rating for a specie of wood is probably useless in and of itself.  I seriously doubt anyone will use that number in some sort of engineering calculation.  The Janka chart allows us to compare the relative hardness of various woods during design and/or fabrication decisions.  For example, on a current client project in the Wood Works, we edged Birch ply panels in Black Walnut to get a nice light-dark contrast.  Black Walnut is 1010 Janka, and Birch is 1260 Janka.  This means that when sanding, the Walnut will abrade away faster than the Birch, which is good to know when one is trying to flush up the trim without sanding through the veneer of the ply!  Also, the flooring industry uses the Janka chart to determine material suitability and durability of engineered wood flooring products.

   You can find the Janka Hardness Chart on Wikipedia, or here in our K-base:  Janka Hardness Chart.  Oh, and the Hardest Tree in the World?

Australian Buloke… 5060 pounds-force!!

Mike @ Doobly-Do Wood Works

Merry Christmas! Where’d the year go?

By   29 Dec 2013


As we draw yet another year to a close, the Doobly-Do-ers would like to take this opportunity to stop for a moment, catch our breath, and reflect back on a year flown by.  This time last year, our online adventure was only a month and a half into its infancy, and the learning curve was nearly vertical.  While creativity, skill, dedication and decades of experience in the wood shop are a boon for business, it does not follow that those same attributes would easily translate to the world of “Online” and “Social Media”.  Again, I hear the Grand Doobly’s voice gruffly resonating in my head:

“If erring is human, wait ’til you ‘go digital’.”  — The Grand Doobly

Okay, so we weren’t as “on fire” in cyberspace as we were in the shop this year.  I concede that.  Our last post was… MARCH?!?  Wow.  We are painfully learning that with great products comes rapid growth… in demand.  With increased demand comes all kinds of demons… schedule crunches, capacity shortage, and the arch-nemesis of all small business… under-capitalization.  Just look what we’ve built this year:

  • Water-balloon hurling catapult;
  • Massive cherry bookcase with a sliding library ladder;
  • Piano repair;
  • Split-level entertainment credenza;
  • Full-wall bookcase with window seat and lighting;
  • Router table;
  • Router lift;
  • Custom kitchen cart;
  • Child’s art easel;
  • Award plaques;
  • Trophy plinths;
  • Military challenge coin racks;
  • Table saw upgrade (Work In Progress);
  • Baluster railing and gates (Work In Progress);
  • Compact all-in-one desk/entertainment center (In Design);
  • Media storage drawers (In Design);
  • Serving cart (In Design);
  • Jib crane (In Design);

I know, I know; where’s all the pictures and the videos and the blogging and the social contact documenting it all?  Could it be that we were really busy?  Could it be that we just suck?  Could it be both?  The World may never know.

All self-flagellating humor aside, the Wood Works has really been humming, especially at the Christmas time of year.  (Keeping Santa on schedule and properly supplied is no easy task… don’t tell The Grand Doobly I said that out loud.)  Our New Year’s Resolution is to improve considerably in the ‘online engagement’ department, so keep a sharp eye for more to come from your favorite Warped wood smiths.  We here at Doobly-Do Wood Works hope you had the Merriest of Christmases, and would like to wish you the Happiest New Year!

Mike @ Doobly-Do Wood Works


Busy! by Doobly-Do!

By   17 Mar 2013

Hello again, Friends!

I apologize for our long absence from the communications array.  The Wood Works has been hopping lately, with our biggest CBTO project yet coming to completion and another just like it about to kick off.  It is truly challenging to keep up with everything the Grand Doobly tasks us to do, but there is nothing like finishing a project and seeing the client smiling.

With the Woody Bookcase finished, our next project is the Morgan Bookcase… considerably smaller, but with a few more custom details that we think you’ll find interesting.  Make sure to visit the gallery often for updates and to see the progress.

Mike @ Doobly-Do Wood Works

Merry Christmas! …and a Happy, Hopeful New Year!

By   22 Dec 2012

Christmas is always an exciting time around the Wood Works, but with our efforts to get with the times and get digital, it is even more so this year.  We’ve started this website and fought (and are still fighting) our way through all the growing pains that brings, gone through a thousand photos of our previous works to pick the best to share, and then lost the digital camera in which they were saved.  We spend a lot of time with our master smith staring at us in gruff, silent disbelief.

“To err is human, but to really screw things up you have to ‘go digital’.”  — The Grand Doobly

All humor aside, we have been hard at work developing product lines for market via the Internet.  We have a seemingly endless font of ideas, all fun and unusual, from old-fashioned toys to holiday decorations to haunted house props to displays for your keepsakes, even to water-balloon siege engines for ultimate water-fight domination.  We are excited in anticipation of these launches and all the rest of the good things to come in 2013.  Now if we could just get that darn shipping module to work in the shopping cart…

God Bless, and have a Merry, Merry Christmas!

Mike @ Doobly-Do Wood Works