Download - ChainSaw Process Book
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ProcessawChain
Chen Lu & Yi LiuSDES-502 Prof. John Schaffeld 02/15/2012 - 03/11/2012
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To design a chainsaw in ergonomic and safety perspectiveResearch&Analysis
Conception
Usability Test
Final design
02/15/2012- 02/23/2012
02/24/2012- 02/29/2012
03/01/2012- 03/06/2012
03/07/2012- 03/11/2012 And process book
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Research
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How to use a chainsaw?
Professional user
Home user{
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Professional user
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FellingFelling is the process of downing individual trees, an element of the task of logging.
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limbing An extension or projecting part of a tree. When the tree is lying on the ground, branches may be storing enormous potential energy through mechanical strain. When a branch is cut, often with a chain saw, this energy can be re-leased suddenly and the branch can jump dangerously. In addition, a branch may be support-ing the tree, and the tree can fall or roll when the branch is cut. For these reasons, delimbing is a skilled operation requiring careful safety planning.
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BuckingBucking means cutting felled trees into short logs.
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Home user
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Cutting branches and woods
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Safety
Kick back
White fingersMuscle presure
Safe cuttingCarpal tunnel syndromeHearing DamageRespiratory problem{
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Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched.
Kick back
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Long period using with chain-saw may cause crucial presure on elbow and front arms area. The presure will cause serious medical issues very badly.
Muscle presure
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Vibration White Finger (VWF) is a Repetitive Stressful Injury also known as Hand-Arm Vibra-tion Syndrome (HAVS). The injury results from the continuous use of vibrating hand machinery for prolonged periods without sufficient breaks.
White fingers
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Keep your body out of the path of a potential kickback. When making any vertical (bucking) cut, keep your body to the left of the guide bar, out of the plane of chain rotation.
Safe cutting
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Carpal Tunnel Syndrome (CTS) is an entrap-ment median neuropathy, causing paresthesia, pain, numbness, and other symptoms in the dis-tribution of the median nerve due to its compres-sion at the wrist in the carpal tunnel.
Carpal tunnel syndrome
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The chainsaw noise can cause hearing prob-lem or even deafness. Power tools can cause hearing damage after only 30 seconds.
Hearing Damage
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The toxic gas and dust from chainsaw may cause Respiratory problem
Respiratory problem
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Existing products
Other brands{
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Analysis
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We asked a lot of people try to hold the old chainsaw for a while until they can not stand the weight. Most of them can only hold the chainsaw for about 2 - 3 minutes. Chainsaw is heavy. They all feel crucial presure, espe-cially from their left forearm muscle.
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Muscle presure analysisBiggest pressure goes to bicep and extensor carpi radialis longus of left arm. Since continuly squeezing rear handle with right hand, the hand muscle will sour.
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We measured main di-mensions of existing chain-saw to help us design our own chainsaw. Handle is the focual point of our observation. We also learned how a chainsaw is combined with different parts.
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The elements of chainsaw
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Conception
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Evaluation 1Develop feasiable ideas from sketches
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Usability Test
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Mock UpsUse foam to build previous designs for usability test
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We built two main bodies and four handles to find out the best combination.
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A1 A2 A3 A4
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B1 B2 B3 B4
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Evaluation 2Ask different people try our new designed chainsaw mock ups
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TESTERS USED IT BEFORE? BEST CHOICE COMMENTS
A4
A1
B1
A4
A4
A1
A4
A1
A1
B1
If I can hold both upper and lower parts of handle 1, it would be better.
Traditional one feels better.Handle 2 is really bad, I can not use it.
The movable part is not stable for power tool like chainsaw.
If I can hold three sides of handle 4, it would be better.
Handle 4 gives me a lot of flexibility.
Movable parts cost too much to produce.
I love A4 a lot. I hate handle 2, it disturb me a lot when I try to use it.
There are reasons for original chainsaw to be like that.
I like traditional one.Handle 2 is bad.
The traditional handle allows users to cut in straight way natually.Hanlde 4 can be used by home users not professional users.I can use handle 1 to cut in low position without blocks.
Based on this result, we decided to develop A1 as our final design.
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Final design
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Rotatable handle can fit with both professional users and home users.Change the handle to an angle to cut in low position without any blocks. Cutting logs straightly with straight position-handle as tradition way.
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How towork with a chainsawhttp://www.jackssmallengines.com/pdf/chainsaw_cons.pdfChainsaws at workhttp://www.hse.gov.uk/pubns/indg317.pdfTophandled chainsawshttp://www.hse.gov.uk/pubns/afag308.pdfBasic chainsaw felling and manual takedownhttp://www.hse.gov.uk/pubns/afag302.pdfTree workhttp://www.hse.gov.uk/pubns/indg278.pdfChainsaw felling of large treeshttp://www.hse.gov.uk/pubns/afag307.pdfChain Saw Safetyhttp://www.uscupstate.edu/uploadedFiles/About_upstate/Planning_and_Organizational_Development/Training/Chain%20Saw%20Safety.pdfChain Saw Safety Manualhttp://www.stihl.co.nz/p/media/download/uk-en/STIHL_Chain_Saw_Safety_Manual.pdfHow to Operate Chain Saws Safelyhttp://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cts=1331520388821&ved=0CEQQFjAA&url=http%3A%2F%2Fwww.flagsafe.ufl.edu%2Fpowerpoint%2Fchainsaw%2520safety%25203.ppt&ei=gmNdT9LsPJCatwfiy5CADw&usg=AFQjCNHgQXx1Et8CfqezTPSWu5DaZlbONgChain Saw Injury Statisticshttp://www.elvex.com/facts08.htmChain Saw Safetyhttp://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=18&cts=1331520660575&ved=0CGwQFjAHOAo&url=http%3A%2F%2Fwisha-training.lni.wa.gov%2Ftraining%2Fpresentations%2FChainsawSafety.pps&ei=jGRdT-rfBc_qtgfu7_mGDA&usg=AFQjCNGkw7dSk1Mt365yffzvX0xpOYTWWASites:http://en.wikipedia.org/wiki/Chainsawhttp://www.stihl.com/http://www.husqvarna.com/us/products/chainsaws/husqvarna-chainsaws-for-homeowners/http://www.hse.gov.uk/treework/safety-topics/chainsaw-operator.htmhttp://www.youtube.com/results?search_query=chainsaw&oq=chainsaw&aq=f&aqi=g10&aql=&gs_sm=3&gs_upl=147l693l0l841l6l6l0l1l1l1l228l530l3.1.1l5l0http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=chainsaw&x=0&y=0
Reference:
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Pro
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Chen Lu & Yi LiuSDES-502 Prof. John Schaffeld 02/15/2012 - 03/11/2012