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Hello,
Another refugee from ‘Garden Trucking’ would like to squeeze in to this splendid engineering forum. It’s good to see that in spite of the efforts of career politicians we still have some very skilled people around. Some of the stuff makes me really jealous. If the RC diggers, trucks and bulldozers had been around fifty years ago I might never have wanted to grow up ! Life would have been a permanent playtime.
My own particular interest is in cable excavators and the last five years have been spent building an 1/8 scale excavator influenced by a Marion -111-M /Lima 1201. It started out as Marion but then I got really interested in the machinery layout of the Lima -1201 which although not as simple is a very clever arrangement of the gearing. Fortunately I hung on to my collection of catalogues from which I gained layout information but it is mostly scratch built developing dimensions as I go along and making the odd detail drawing when necessary. The revolving frame is made up of two twin sets of ‘castings’ which are machined out of solid to house the turntable rollers and mounting lugs for hook roller bogies. These are then mounted between side frame plates which at the front make up one of the boom feet each side. As you can see it’s quite a lump. The crawler frames are approximately 26 inches in length and 18 inches wide, turntable gear diameter 12.5 inches. Overall Length of the revolving frame with the tail end section will be around 36 inches but has yet to be determined by back end design and power unit requirements. I would guess the weight is in the region of 230 lbs as it stands but will increase quite a bit even with two sets of track pads. I’ll let you know when I get around to putting it on the scales.
Head on view from front showing boom feet , front hook roller bogie mounting bracket and front turntable roller pins
Another view from the front also showing some internal construction detail of the truck frame
Machining underside of frame stretcher
View of front hook roller and machined swing ring gear
unfinished drumshaft with winding drum clutches
front drumshast showing main transmission gear
clutch housing showing cooling louvres
trial mesh of large gear and left hand clutch housing gear assemblies
Front view with detail of crawler drive tumblers
Almost complete. Final machining to be done after test assembled to mating components
Front sub component assembly after machining deck
Showing back of roller mounting carriage with aperture for inner end of roller shaft bearing block and block
before it is fitted into place for maching in situ. Location for bolting carriage to front main component can
also be seen. These holes are later recessed for roller clearance. When machining is completed the bearing
apertures also allow access to tighten the countersunk securing screws.
Both bearing blocks inserted and roller mounting shafts in place
This view of the back shows the front frame stretcher anchor bolted in place. This secures the bearing blocks
althogh they are a snug fit anyway
Tumbler ready to remove flange and turn over
Flange removed and ready for machining other side
First machining position on reverse side of drive tumbler
Part machned tumbler mounted ready for removing surplus webs of metal btween driving lugs
Position of one set of four quartering holes can be seen in this view
Machining in progress
Cleaned out slots
First stage of relieving driving lug flanks tilting milling angle to 25 degrees. Comparison before
and after relieving can be easily compared.
Relieving of driving lugs completed on one side and ready for turning over
Tumbler flanks been relieved and driving lug is ready to have quartering location removed.
Driving lug finish machined.
Completed driving tumbler.
PLEASE NOTE ALL MACHINING HAS BEEN DONE WITHOUT THE AID OF A SAFETY NET, PARACHUTE OR KNEEPADS:
!