MicroTrac: Difference between revisions

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#redirect [[Microtractor]]
 
[[Image:Hoselengths.jpg]]
[[Image:Microtrac4.jpg|thumb]]
[[Image:MicroTrac1.jpg|thumb]]
[[Image:MicroTrac2.jpg|thumb]]
[[Image:MicroTrac3.jpg|thumb]]
 
MicroTrac is a small scale, walk-behind version of [[LifeTrac]]. '''This page documents MicroTrac Prototype I'''.
 
==Industry Standards==
*The [http://www.abbysguide.com/ope/reviews/39-0-1.html BCS Tiller] is the main competition.
 
==Tools==
*Tiller
 
*Mower
 
*Chipper
-Laimet conical screw design. Makes nice big, uniform sized chips.
 
==Design==
 
[[File:Microtrac_Design1.blend]]
 
==Engine==
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.
 
===Specifications===
Engine should be a 12-20 hp 1 cylinder diesel engine, with air cooling. The engine will run the hydraulic pump.
 
We have a 17.5 HP engine.
 
Dimensions: 18x16x13"
Shaft: 1x?"
 
Turns CW from above. CCW from below.
 
===Sourcing===
**[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]
*[http://cgi.ebay.com/New-Onan-2-Cylinder-Diesel-Engine-14-HP-DJEAMMS4496A_W0QQitemZ330310425172QQcmdZViewItem 14 hp 2 cylinder engine no starter $975]
*[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]
*[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]
*[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]
*[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]
*[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 ]
*[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]
*[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 ]
*[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]
*[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]
*[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]
 
**[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 ]
 
*[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 ]
*[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]
 
==Hydraulic Pump==
 
===Specifications===
*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]
 
===Sourcing===
*.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]
 
 
==Coupler==
 
 
 
==Wheels==
[[Image:Wheelmotors.jpg|thumb|32 cu in wheel motor, 5130 in oz torque, 145 rpm at 20 gpm]]
 
*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
*doubled up for traction
*have support wheels on the back sides so it doesn't tip easily
*drive wheels the same as lifetrac, 30" high 10" wide
 
 
 
==Power Cube (MicroTrac engine cube) Details==
[[Image:microtrac_couplerhalf1.jpg|thumb|Engine-side coupler half, 1" shaft, $9.86, Type E]]
[[Image:microtrac_couplerspider.jpg|thumb|Spider insert, 1" shaft, coupler half, $14.36, type E]]
[[Image:microtrac_couplerhalf2.jpg|thumb|Pump-side coupler half, 5/8" shaft, $9.86, Type E]]
 
*The coupler halves and spider are shown in the pictures, from McMaster Carr [http://www.mcmaster.com/#6408k15/=1gyaq6 page 1157]
 
==Power Calculations==
===Pump===
[[Image:hydcalc.jpg|thumb|Hydraulics Calculations from [https://surpluscenter.com/techhelp.asp?UID=2009041610053391&catname=hydraulic]]]
*From [https://surpluscenter.com/] - Pumping = 1 Hp = 1 GPM x 1500 Psi - (linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)
**For the above pump, 14.2 gpm with 3000 psi indicates 28.4 hp requirement
*Hp to drive hydraulic pump = Psi x GPM / 1714
**For the above .97 cu in pump, 3000*14.2/1714 = 24 hp
**If we run at 2200 psi => 18 hp required
**For .86 cu in pump, need 3000*12.6/1714 = 22 hp
**For the same with 2500 psi, 18.3 hp
 
===Power Available===
*Assuming 85% pump efficiency, we have 17.5*.85=14.8 hp power available to the machine
===Wheel Motor Calculations===
 
*32 cu in wheel motor: 20 gpm, 5170 in lb torque, 145 rpm
**Using 12 gpm, 5170 in lb torque, at 87 rpm - uses 7 hp of the engine
 
===Spider Torque Rating===
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.
 
==Resource Map==
 
(<FONT COLOR="red">could use more review</FONT>)
 
Reviewers:
*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
**Useful response, including hydraulics primer, Mr. Hanson's contact as a consultant, etc.
**The response claims need for 30 hp if we want 15 gpm at 2200 psi. We have 12 gpm at 2500 psi.
***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)
Coupler info:
*http://www.lovejoy-inc.com/uploadedFiles/Catalogs/jw.pdf
*http://www.ohiobelting.com/pdfs/lovejoycplg.pdf
 
==Notes==
*On calculations (right picture) - formula for horsepower to drive pump (with 1714 factor) includes the efficiency of the pump (about 85%)
 
==Parts Buildout==
 
[[Image:microtracpartsbuild.jpg]]
 
[[Category:Earth moving]]
 
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Revision as of 03:08, 20 September 2011

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