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| {{GVCS Header}} | | {{GVCS Header}} |
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| [[Image:Hoselengths.jpg]]
| | {{Hint|Latest version is '''[[MicroTrac_v17.10]]}} |
| [[Image:Microtrac4.jpg|thumb]]
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| [[Image:MicroTrac1.jpg|thumb]] | |
| [[Image:MicroTrac2.jpg|thumb]]
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| [[Image:MicroTrac3.jpg|thumb]]
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| MicroTrac is a small scale, walk-behind version of [[LifeTrac]]. '''This page documents MicroTrac Prototype I'''.
| | [[Image:MicroTrac1.jpg|400px|thumb|Microtractor Concept]] |
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| ==Industry Standards== | | =MicroTrac Geneaology= |
| *The [http://www.abbysguide.com/ope/reviews/39-0-1.html BCS Tiller] is the main competition.
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| ==Tools==
| | *[[MicroTrac Genealogy]] |
| *Tiller | | *[[MicroTrac 2015]] |
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| *Mower
| | ==Working Model, 5/2013== |
| | April 17 2013 |
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| *Chipper
| | [[File:ptTRAC1.jpg|500px]] |
| -Laimet conical screw design. Makes nice big, uniform sized chips.
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| ==Design==
| | [[File:ptTRAC2.jpg|500px]] |
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| [[File:Microtrac_Design1.blend]] | | [[File:ptTRAC2.1.jpg|500px]] |
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| ==Engine==
| | [[File:ptTRAC2.skp]] |
| The engine will be a modular removable unit consisting of engine, fuel tank, hydraulic pump, hydraulic reservoir, and frame. The frame will be the hydraulic reservoir, made out of 4x4" square tube.
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| ===Specifications=== | | ==Corners for structural tubing== |
| Engine should be a 12-20 hp 1 cylinder diesel engine, with air cooling. The engine will run the hydraulic pump.
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| We have a 17.5 HP engine.
| | Corner inserts are one possibility for the Power Cube and for connecting tubular steel members. They would make better use of space that is currently used with the "layering" of tubes in current designs. |
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| Dimensions: 18x16x13"
| | Mention was made that adding corners would weaken the overall design, but this has not been proven. A structural analysis would be necessary to find out for sure. |
| Shaft: 1x?"
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| Turns CW from above. CCW from below.
| | Here is an image of a possible corner: [[Image:PC7s-frame-with-corners.png ]] |
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| ===Sourcing===
| | Here is the Sketchup drawing: [[File: PC7s-frame-with-corners.skp Frame with corners]] |
| **[http://desc.shop.ebay.com/items/Generators__diesel-hp-cylinder_W0QQLHQ5fTitleDescZ1QQLHQ5fPriceZ50Q2eQ2e2Q2c000Q40cQQQ5ftrkparmsZ66Q253A2Q257C65Q253A15Q257C39Q253A1QQ_dmdZ1QQ_dmptZBIQ5fGeneratorsQQ_in_kwZ1QQ_ipgZ50QQ_mPrRngCbxZ1QQ_okwZdieselQ20hpQ20cylinderQQ_sacatZ106437QQ_scZ1QQ_sopZ15QQ_trksidZp3286Q2ec0Q2em14?_fpos=64469&_fcid=1&gbr=1 from here]
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| *[http://cgi.ebay.com/New-Onan-2-Cylinder-Diesel-Engine-14-HP-DJEAMMS4496A_W0QQitemZ330310425172QQcmdZViewItem 14 hp 2 cylinder engine no starter $975]
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| *[http://cgi.ebay.com/NEW-Aurora-6000-Watt-Diesel-Generator_W0QQitemZ380106916786QQcmdZViewItemQQptZBI_Generators?hash=item380106916786&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318 11 hp 1 cylinder generator $899.00]
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| *[http://cgi.ebay.com/Heavy-Duty-Silent-Diesel-Generator_W0QQitemZ380106472733QQcmdZViewItemQQptZBI_Generators?hash=item380106472733&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318 13 hp 1 cylinder silent $1300]
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| *[http://cgi.ebay.com/Industrial-8-250-Watt-Electric-Start-Generator_W0QQitemZ330311074168QQcmdZViewItemQQptZBI_Generators?hash=item330311074168&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318 13 hp $695 GAS]
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| *[http://cgi.ebay.com/23HP-Water-Cooled-Diesel-Engine-with-radiator_W0QQitemZ180331677925QQcmdZViewItemQQptZBI_Farm_Supplies?hash=item180331677925&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 23 hp water cooled diesel engine with radiator $1000 - $1349]
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| *[http://cgi.ebay.com/WHITE-FIELD-BOSS-2-62-DIESEL-UTILITY-TRACTOR-ONE-OWNER_W0QQitemZ370165894383QQcmdZViewItemQQptZTractors?hash=item370165894383&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1308 62 hp 4 cylinder tractor $1828 ]
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| *[http://cgi.ebay.com/BELARUS-505M-FARM-TRACTOR-NO-RESERVE-FIXER-UPPER_W0QQitemZ250380038290QQcmdZViewItemQQptZTractors?hash=item250380038290&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 65 hp 4 cylinder tractor $710]
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| *[http://cgi.ebay.com/DEUTZ-DIESEL-POWER-UNIT-ENGINE-MOTOR-F3L-1011-40HP-3cly_W0QQitemZ300296916733QQcmdZViewItemQQptZBI_Farm_Supplies?hash=item300296916733&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 40 hp 3 cylinder $1500 - $2300 ]
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| *[http://cgi.ebay.com/John-Deere-830-Diesel-Tractor_W0QQitemZ170306687641QQcmdZViewItemQQptZTractors?hash=item170306687641&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 35 hp 3 cylinder tractor $1185]
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| *[http://cgi.ebay.com/ebaymotors/Volkswagen-Beetle-New-GLS-TDI-2000-VW-BEETLE-GLS-TDI-DIESEL-1-OWN-5SP-SNRF-NO-RESERVE_W0QQcmdZViewItemQQ_trkparmsZ66Q3a2Q7c65Q3a1Q7c39Q3a1Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem120385960498QQitemZ120385960498QQptZUSQ5fCarsQ5fTrucks 90 hp 4 cylinder diesel 2000 vw beetle $2000]
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| *[http://cgi.ebay.com/NEW-11-hp-air-cooled-diesel-engine-12v-electric-starter_W0QQitemZ330306984305QQcmdZViewItemQQptZLH_DefaultDomain_2?hash=item330306984305&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 11 hp 1 cylinder $400]
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| **[http://desc.shop.ebay.com/items/__diesel-engine-hp-cylinder?LH_TitleDesc=1&LH_Price=50..2%2C000%40c&_trkparms=66%253A2%257C65%253A1%257C39%253A1&_dmd=1&_fsct=&_in_kw=1&_ipg=50&_mPrRngCbx=1&_oexkw=&_okw=diesel%20engine%20hp%20cylinder&_sop=1&_trksid=p3286.c0.m14&_pgn=4 more from here ]
| | ==Overview== |
| | MicroTrac is a small scale, walk/ride-behind version of [[LifeTrac]] suited for construction, agriculture, and general home and garden maintenance. |
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| *[http://cgi.ebay.com/13-7-HP-INDUSTRIAL-DIESEL-ENGINE-PERKINS-402C-05_W0QQitemZ380104518370QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item380104518370&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318 13.7 hp 2 cylinder $666 ]
| | {{Video}} |
| *[http://www.uspowerco.com/inventory_item.php?id=272 Perkins 402C 13.7hp 2 cylinder Same as above, asked for quote 3/5/09 talked to jeff]
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| ==Hydraulic Pump== | | ==Product Ecology== |
| | '''Made with''' |
| | *{{Induction Furnace}} |
| | *{{Welder}} |
| | *{{Torch}} |
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| ===Specifications===
| | '''Equips''' |
| *10.1 GPM at 3600 RPM and 2500 PSI, requires 17.3 hp to drive it - best match to available engine - [https://surpluscenter.com/item.asp?UID=2009050111530930&item=9-1897-A&catname=hydraulic] | | *{{PowerCube}} |
| | *{{Tiller}} |
| | *{{Chipper}} |
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| ===Sourcing=== | | ==Components== |
| *.677 cu in, 10.1 gmp @3600 RPM, 3000 PSI max, 4000 RPM max, $180 - [https://surpluscenter.com/item.asp?UID=2009050111530930&item=9-1897-A&catname=hydraulic] | | *[[QA Plate]] |
| | *[[Wheels]] |
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| | ==Status== |
| | The Microtractor is currently in the Prototype stage of Product Development. Later prototypes aim to integrate lessons learned from [[LifeTrac]] development. |
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| ==Coupler==
| | See [[GVCS Rollout]] for more information. |
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| | | ==See Also== |
| | | *[http://www.motherearthnews.com/Modern-Homesteading/2006-12-01/Walk-Behind-Tractor-Guide.aspx Walk Behind Tractor Guide] |
| ==Wheels== | | *[http://www.abbysguide.com/ope/reviews/39-0-1.html BCS Tiller] |
| [[Image:Wheelmotors.jpg|thumb|32 cu in wheel motor, 5130 in oz torque, 145 rpm at 20 gpm]]
| | *[https://groups.google.com/forum/?hl=en&fromgroups#!forum/microtractor-development MicroTractor Google Group discussion] |
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| *one set of drive wheels in the middle balanced with the engine so the Microtrac can be rotated easily, with a motor on the side
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| *doubled up for traction
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| *have support wheels on the back sides so it doesn't tip easily
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| *drive wheels the same as lifetrac, 30" high 10" wide | |
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| ==Power Cube (MicroTrac engine cube) Details==
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| [[Image:microtrac_couplerhalf1.jpg|thumb|Engine-side coupler half, 1" shaft, $9.86, Type E]]
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| [[Image:microtrac_couplerspider.jpg|thumb|Spider insert, 1" shaft, coupler half, $14.36, type E]]
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| [[Image:microtrac_couplerhalf2.jpg|thumb|Pump-side coupler half, 5/8" shaft, $9.86, Type E]]
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| *The coupler halves and spider are shown in the pictures, from McMaster Carr [http://www.mcmaster.com/#6408k15/=1gyaq6 page 1157]
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| ==Power Calculations==
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| ===Pump===
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| [[Image:hydcalc.jpg|thumb|Hydraulics Calculations from [https://surpluscenter.com/techhelp.asp?UID=2009041610053391&catname=hydraulic]]]
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| *From [https://surpluscenter.com/] - Pumping = 1 Hp = 1 GPM x 1500 Psi - (linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)
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| **For the above pump, 14.2 gpm with 3000 psi indicates 28.4 hp requirement
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| *Hp to drive hydraulic pump = Psi x GPM / 1714
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| **For the above .97 cu in pump, 3000*14.2/1714 = 24 hp
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| **If we run at 2200 psi => 18 hp required
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| **For .86 cu in pump, need 3000*12.6/1714 = 22 hp
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| **For the same with 2500 psi, 18.3 hp
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| ===Power Available===
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| *Assuming 85% pump efficiency, we have 17.5*.85=14.8 hp power available to the machine
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| ===Wheel Motor Calculations===
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| *32 cu in wheel motor: 20 gpm, 5170 in lb torque, 145 rpm
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| **Using 12 gpm, 5170 in lb torque, at 87 rpm - uses 7 hp of the engine
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| ===Spider Torque Rating===
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| The Hytrel coupler spider has a 401 in lb torque rating. This is at 3600 rpm. If this pump is driving a hydraulic motor at 87 rpm (wheel motor at 12 gpm fluid flow, at its rated torque), what would be the maximum torque that the 87 rpm could have? 401*3600/87 = 16600 in lb. That is well within the 5130 in lb torque of the wheel motor. Coupler spider will hold up.
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| ==Resource Map==
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| (<FONT COLOR="red">could use more review</FONT>)
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| Reviewers:
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| *http://www.tractorbynet.com/forums/build-yourself/140170-homemade-modular-hydraulic-engine.html | |
| **No response as of 4.28.09 | |
| *http://forums.hydraulicspneumatics.com/eve/forums?a=tpc&s=4721063911&f=8641063911&m=74110526&r=74110526#74110526
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| **Useful response, including hydraulics primer, Mr. Hanson's contact as a consultant, etc.
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| **The response claims need for 30 hp if we want 15 gpm at 2200 psi. We have 12 gpm at 2500 psi.
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| ***CadTrac uses 16 gpm pump and 18 hp engine, at 2000 psi for 1/2 of the flow (to wheels) and 1000 psi to rest of flow (loader)
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| Coupler info:
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| *http://www.lovejoy-inc.com/uploadedFiles/Catalogs/jw.pdf
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| *http://www.ohiobelting.com/pdfs/lovejoycplg.pdf
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| ==Notes==
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| *On calculations (right picture) - formula for horsepower to drive pump (with 1714 factor) includes the efficiency of the pump (about 85%)
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| ==Parts Buildout==
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| [[Image:microtracpartsbuild.jpg]]
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| [[Category:Earth moving]]
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| {{GVCS Footer}} | | {{GVCS Footer}} |
Hint: Latest version is MicroTrac_v17.10
