Author:Jay NoackI'm a teacher. Hide your kids. Just like the rest of you, I'm here because I like to build stuff, and it's about time I was more diligent about documenting mybuilds. More importantly, I think I'd like to eventually escape the harsh Canadian winter, move to California, and work for Instructables. I think that's whereyou guys are???
Intro: Building a Child's Muskoka ChairA few years ago, I designed this particular Muskoka Chair to give to my nephew as a Christmas present. These are more commonly referred to as Adirondack chairs inthe States. I decided that this would also be a great project for my Grade 11 Woodworking class. I started the project about a month before the holidays and startedtaking orders, using my Nephew's chair as an example. I decided to set the project up so that students would work in groups to construct the parts of the chair andcomplete assembly. Because the final products were being sold, my evaluation of their work weighed heavily on the group's ability to perform rigorous quality controlmeasures.
LEARNING OUTCOMES:
By following a specific set of instructions, and meeting high production standards, students will be forced to improve accuracy with respect to print-reading,1.measurement, machine set-up, and assembly.Students will also develop an appreciation of the importance of using jigs and fixtures in the manufacturing process.2.Students will also develop skills in problem solving, organization, and teamwork.3.
I'm not going to include instructions for each of the jigs I made for this project. My shop is likely quite different than yours and you can develop your own based on mypictures. I will however, let you in on a few tips that I have learned after running this project a few times.
TIPS:
Let the students build the project without jigs first. This really helps them understand the usefulness of taking the extra time to make a jig.1.Take the time to make easy-to-use jigs. This is important for SAFETY, and for longevity. A poorly designed jig will be misunderstood and misused by students.2.Trust me, nothing is fool proof. Someone in your class will find a way to ruin your best creation.Use a log-sheet of some sort. The students need a way to track their progress.3.Have a good storage system in place for project work, and stress the importance of not wasting materials. I evaluate groups on their quality control, and4.efficiency. Because of this, you will find that groups will try to hide their mistakes, and grab some more lumber, or even other group's completed work.Stress the importance of problem-solving. To try and detract from the possibilities of the above mentioned step, I remind students that I'm equally impressed by5.their ability to problem-solve and document their mistakes and fixes. For example: Some groups might cut an arm piece too short. Could it be saved and used fora leg?I have yet to create assembly jigs. I have found that despite my best efforts, there are very few groups that will produce accurate enough pieces to make6.assembly jigs worthwhile. Even a sixteenth of inch difference at the table saw, will cause problems when it comes to assembly.
The beauty of this design, is the simplicity of the pieces. Unlike so many Adirondack/Muskoka chairs out there, this design uses pieces that are all the same width(3.5").The arms and back pieces all have matching curves, and are all the same length (18"). This is the perfect project to explore mass-production with.
File Downloads
muskoka_chair.pdf (87 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'muskoka_chair.pdf']
Step 1: Material Selection & PreparationI typically have students use basswood or poplar when making these chairs. They're both soft and easy to work with, and have fewer knots than pine. It's really importantthat students are careful with their material selection.
They should:
avoid knots, splits, and cracks1.make sure that all pieces of their chair are close in in grain pattern and colour2.ensure that joiner fence is square, so that edges are accurate3.ensure that boards are planed to a thickness of 3/4" and cut to a width of 3-1/2"4.ensure that end cuts are square5.make sure that they have the correct number of pieces for chair6.BE SAFE!!7.
Image Notes1. cut your pieces to rough length. add 1" to each piece. DO NOT CUT TOFINAL LENGTH HERE!!!
Image Notes1. a push stick, feather board, and push block help keep your hands clear andhelp you join square edges by keeping the board flat against the fence
Image Notes1. really important the the fence is set correctly. 3-1/2" is a MUST!!!
Image Notes1. always use a push stick2. a feather board helps keep the board against the fence to ensure uniform width
Step 2: LayoutUse your plans to layout each of the pieces. I try to encourage my students to be picky about which pieces will be used for the arms of the chair.
6 of the pieces will be 18" in length. 3 are for the arms, and three for the back rest.1.Trace both ends of the curved template on 3 pieces for the arms.2.Trace the curve on to one end of the two outside back rest pieces, as well as the two pieces that will be used for the legs.3.The 4 seat pieces will be cut to a length of 12-1/2" on the mitre saw. Make sure that students use a stop block so that all pieces are exactly the same length.4.The final 2 pieces are for the front legs, and they should be cut to a length of 12".5.Cut the curves on the band saw. Make sure to cut as close to the line as possible without going over it.6.
Step 3: Sanding the CurvesIn order to speed up the process of cutting and sanding the curved ends, I built this quick and easy sanding jig. All you need is a flat base, with a 3/4" strip glued to thebottom to match the track on your sander. The board that you attach on the top simply needs to pivot 3-1/2" from the edge of the base.
It's important that you don't sand the ends of the arms so that the length ends up being less than 18". I find that students often get carried away when they sand becauseit's so much FUN!
Image Notes1. pivot point is 3-1/2" from the edge of the base. Pre-drill a hole and screw the toppiece loosely to the base so that it rotates freely
Image Notes1. remind students not to go past 180 degrees. You don't want gouges sanded intothe sides of each piece.
Step 4: Cutting the LegsTo cut the legs, I employ the use of another jig which is slightly more intricate than the first. Again, depending on your shop set-up, you might choose to build this onedifferently.
Start by clamping the first leg into the base and lining up the jig on the left side of the mitre saw.1.Cut only as far as you need to go in order to cut through the leg. You'll see from the pictures, that some of my students have been slightly more ambitious.2.Once the first cut has been made, the jig gets flipped around to the other side to complete the second cut.3.It's important at this stage that the line on the jig is lined up with the convenient laser on this particular mitre saw.4.The goal here is to make two identical legs. Make sure that the curved section of the leg touches the edge of the jig before it is clamped in place.5.If you're building this project for the first time, the appropriate measurements for laying out these cuts are available on the PDF plans.6.
Image Notes1. You can't have enough toggle clamps in your shop. They help keep fingersaway from blades. SAFETY FIRST!!
Image Notes1. make sure that curve is touching the edge of the jig
Step 6: CustomizationNow if you're lucky, you have access to some sort of CNC at your school or work. The ability to customize these chairs makes them fly off the production line atChristmas time and whenever someone you know brings a little one into the world.
If you don't have a CNC, you can invest in some letter templates for your hand held router, or even wood burn some designs on the front. Heck, you don't have to putanything on there at all.
Please remember to put your design on one of the seat pieces that is 12-1/2" long. Again, pick the nicest piece, as this will be the one that everyone notices.
Image Notes1. Are you kidding me? This is a pentium 3 running windows 98. Maybeinstructables will help me upgrade some day.
Step 7: Assembly PART 1 - The LegsThe assembly of the legs is quite simple.
Put the legs in the template making sure to put the nicest side face down.1.Make sure that the curved edges are touching the side of the jig.2.Make sure the you used the 12" long pieces and not the 12-1/2" long pieces.3.Countersink three holes for each leg.4.Use 1-1/4" screws to attach the legs.5.I sometimes make students use a screwdriver so that they don't over drill the screws. Some kids can get carried away with a drill.6.Before you proceed with assembly, make sure that both sides came out equal. It's easier to fix a mistake before you put the entire chair together.7.
Image Notes1. I drew lines on the jig at the 12" mark in order to make sure the correctpieces are clamped in place2. should be touching on both sides
Image Notes1. If you're not using the jig, check your plans for the placement of the legs. Thesquare cut on the leg should be at the 7" mark
Image Notes1. Before going any further, check to make sure that the legs match.
Step 8: Assembly PART 2 - Attach the seat piecesAssembly for some students is the hardest part, especially if they have made any mistakes along the way with measurement. Because there are no more jigs for the restof the build, it's really important to take your time with each step.
Each of the seat pieces must have 4 countersink holes drilled 3/4" from the top edge, and 3/8" from the ends.1.This can be laid out by hand and drilled with a drill2.This step can also be more accurately performed by setting up a jig on the drill press. This saves you the time of marking out each piece, and also ensures that3.students will not countersink too deep.Start by screwing the name plate to one of the leg assemblies. Make sure that everything is held tightly in place. NO GAPS!!4.Continue with the other leg assembly.5.Next you'll add the first seat piece. Countersink holes are in the same position.6.Continue with the remaining seat pieces making sure that the gaps between each are consistent. I often provide a spacer for this step. The space should ideally7.be between 1/8" and 1/4"When all of the seat pieces have been attached, check the chair again for accuracy. It should sit flat on the table. Make sure you test on a perfectly flat surface.8.
Image Notes1. Have students check the location of this bottom screw hole. A common mistakethat they seem to make, is that they drill it too low, and it misses the leg on theother side. If they've made all the measurements correctly, it should be 3/4" - 7/8"from the bottom edge
Image Notes1. make sure that the name plate is flush
Image Notes1. make sure that the ends of each seat piece are flush with the outsidesurface of the leg.
Step 9: Assembly PART 3 - The armsBefore you can assemble the arm section, you need to make one more cut and use one final jig.
Choose the arm piece that is the least attractive of the three. You want to use it for the back.1.Set you table saw to an angle of 70 degrees.2.I highly recommend using a jig for this step. SAFETY is so important and you have a difficult time pushing that round curve safely through the saw with a push3.stick.Use the jig to set the position of the fence. Again, remind students that you don't want them to cut your jig smaller each time. Mine's had a few trims over the4.years.Clamp your back arm piece in the jig with the best side up, and complete the cut.5.Use the arm template from before and trace the countersink holes on the bottom side of the piece.6.Countersink each hole.7.Use the arm assembly jig to match up the curves of the arm pieces. Complete one side and then continue to the next, making sure to hold the pieces tightly to the8.jig.
Step 10: Assembly PART 4 - Attach the armsWhen attaching the arms, it's a good idea to lightly mark out the position of the arms in pencil on the underside of each arm.
The exact measurements are listed on the plans. Again, it's hard to design a jig for this step because you get so many slight variations at this stage.1.The positions of the screw holes should be marked on the top of each arm and countersunk.2.You can then position the arms in place by lining up the light pencil lines.3.Hold it tightly in place and install the screws.4.In the last picture of this step, you'll notice that I made the mistake of laying out the countersink holes in the wrong position. Please don't repeat my blunder. I think5.I got distracted by all the photos I was taking during this process.Problem solving time......6.This was solved before moving on to the next step.7.
Image Notes1. Please make sure you get the screws in the right place!! Even I make mistakeswhen I'm not careful.
Step 11: Assembly PART 5 - Attach the back piecesIn the final part of assembly you'll attach the back pieces to the chair.
Hold the first piece so that its bottom edge is flush with the bottom surface of the seat piece. This will help you determine where the countersink holes should go.1.Again, I don't provide an exact measurement for this because there end up being slight variation among the groups.Line up all three back pieces and square a light line across to layout the countersink holes. Each hole should be 3/4" from the edge, and there should be 2 holes2.per piece.Each back piece also needs to be countersunk on the opposite side of the board along the bottom edge.3.Position the first back piece in place and use a square to make sure that it's standing straight up.4.Screw it in on the front side, and then flip the chair over and screw the back screws in place.5.Repeat the same steps for the opposite side of the chair.6.After installing the second back piece, use a tape measure to ensure that the remaining gap is the same at the top and bottom. If it's not, you'll have to do some7.problem solving to help disguise whatever mistake has been made.Finally, install the middle back piece, ensuring that the gap is consistent on both sides. Get it right the first time, because it's hard to correct if you do it incorrectly.8.
Step 12: The FINAL PRODUCTHannah and Keira got new chairs for Christmas this year. The first picture is of my Nephew Jack in the original chair that I built without the use of any jigs. WHOA!!
Step 13: Future plans....My classes have produced and sold over 50 of these chairs. We used the proceeds to build and arcade machine a couple years ago. What a great incentive it was! Wealso purchased a pretty sweet ping pong table as well. Nothing like a good game of table tennis to help motivate the students to clean the shop before the end of class.
Anyway, we have made chairs for twins before, which inspired me to draw up a new set of plans for a double chair.
Who knows what kind of cool things my students could be making in the future? Wink, wink, nudge, nudge, SHOPBOT
I currently teach woodworking, animation, set design, tech design, and integrated technology at the high school level. I'm not going to lie.... my students would benefitfrom this BIG TIME!!!
Raigmoul says: Jan 3, 2012. 11:27 PM REPLYHi Jay,This is a very detailed, very well written and very well photographed 'ible. Well done mate, your workmanship is remarkable, your design is both simple andelegant.
I wish I had the tools available to you at your school, I'm certainly going to make one of these for my little daughter, she'll love having her own chair :-)
