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{{site header}}
#redirect [[MicroTrac v17.10]]
[[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]]
 
=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
 
=Bill of Materials=
 
==Engine Cage and Controls==
[[Image:microtrac_engineback1.jpg|thumb]]
[[Image:microtrac_engineback2.jpg|thumb]]
[[Image:microtrac_pump677.jpg|thumb]]
[[Image:microtrac_valve.jpg|thumb|3 spool, OC, 25 gpm valve]]
 
{| border="1"
|-
|Part - Cage || Weight || Price
|-
|[[https://surpluscenter.com/item.asp?UID=2009050111530930&item=9-1897-A&catname=hydraulic .677 cu in, 10.1 gmp @3600 RPM, 3000 PSI max, 4000 RPM max, $180]] || 9 lbs || $181
|-
|[http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_12006_12006 NT filter] [https://surpluscenter.com/item.asp?UID=2009050412033450&item=9-059&catname=hydraulic or SC filter] || 2 lbs || $17
|-
|[http://www.mcmaster.com/#6408k15/=1gl6m4 or type E coupler half 1/4" key 2.5" o'all long (2 of these,for] || .65 lbs || $9.86
|-
| Parts total || 12 lbs || $220.85
|}
 
{| border="1"
|-
|Part - Controls|| Weight || Price
|-
|[https://surpluscenter.com/item.asp?UID=2009041514290385&item=9-7175&catname=hydraulic 3 spool valve] || 35 lbs || $200
|-
| Parts total || 35 lbs || $200
|}
 
Other choices, not used:
|-
|[http://www.grainger.com/Grainger/items/4X193 L095 coupler half 1" shaft 1/4" key 1-1/16" long] || .65 lbs || $15.28
|-
|[http://www.grainger.com/Grainger/items/1A925 L095 hytex coupler insert] || .04 lbs|| $18.29
|-
|[http://www.grainger.com/Grainger/items/4X191 L095 coupler half 3/4" shaft 3/16" key 1-1/16" long] or [http://www.grainger.com/Grainger/wwg/productIndex.shtml?from=Search&newSrch=yes&operator=keywordSearch&search_type=keyword&action=Go%21&QueryString=6X072&submit.x=361&submit.y=34 5/8"] || .7 lbs || $15.28
 
*Note on 3 spool valve - about 1900-3400 PSI relief setting
 
==Frame Metal==
 
2x2x1/8" is 3.05 lbs/ft
 
Steel @ $0.70 per/lb
 
{| border="1"
|-
|Part || Weight || Price
|-
|2x2x1/8" square tube 29" long, x 6 || 44.22 lbs || $30.95
|-
|2x2" square tube 24" long, x 4 || 24.4 lbs || $17
|-
|2x2" square tube 20" long, x 8 || 40.66 lbs || $28.46
|-
|2x2" square tube 7" long, x 2 || 3.55 lbs || $2.49
|-
|7x25" plate 1/4" thick ||  ||
|-
| Tubing total || 125 lbs || $94
|-
|}
 
Total length of 1/8" tubing - 37 feet, or 4 sticks of 10' lenght.
 
 
+17.5 HP gas engine 60 lbs $?
 
+resirvoir 10 lbs $?
 
+battery 20 lbs $23
 
Total: 215.66 lbs
 
=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
 
After using the walk behind thai Tractors
http://www.siamkubota.co.th/en/product_detail.aspx?pid=16&cid=3
http://en.wikipedia.org/wiki/File:1-achsiger_Traktor.jpg
 
For Plowing and using a small dozer blade and towing a trailer.
I can say that your effective Uni wheel will be a pain in the backside to use.
having short legs to help stabilize. Is a huge basic design flaw.
Trust me you are working hard with these machines plowing. You have to apply downward pressure to the handlebars
to get the coulter or disk into the ground then modify that pressure to maintain cutting depth.
You dont want to be trying to balance the tractor in the vertical plane as well.
What about surface imperfections that will cause imbalance.
Either get a Gyro or make  it two wheels that are spaced at least 900mm apart.
If you are going to go Hydraulic that may mean two drive motors and  spools so that you can turn easily.
Regards Whitworth
 
=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:MicroTrac]]
[[Category:LifeTrac]]
[[Category:Hydraulics]]
[[Category:OSA]]

Latest revision as of 16:23, 4 May 2019

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