Wish a speedy recovery, you can't start a new year sic.
Went through the drawing to make a Bill of Material with stock blank sizes.
Turns out I have 1/2 of the metal already but the rear wheels blanks and all 4 tires are difficult to source
I think that most of De walls drawings can be a bit like that ,plus he tends to cram to many on each sheet ,just my opinion,but then his drawings are free , and when l mailed him with a query he mailed back just fine and seems a dam nice chap
The drawing have several missing dimension, but most are not critical and can be eyeballed since the details are scaled. All said the drawings are worth much more that what we paid for.
I found the ball bearing dimension impossible to source so I had to verify that what is available on the market could be adapted in.
One observation is that, except for the Modulo 1 gears, all gears and racks dimension do not conform with the gear theory. There a couple of Modulo ~1.35 which is not standard either as metric or Diametral Pitch.
Yes tornitore l agree with you ,the gears look a bit hit an miss ,as for the bearings l am going to use a mixture of metric an imper ones and with luck sort it out as l go,going back to the gears l intend to use 16 dp for the bull gear set up,thou l am not in to deep yet with the model but make a couple of bits as a change from my steam tractor ,plus have been given a book an plans of a steam donkey engine by W M Harris so have been gathering bits for that as well ,yep l know to many projects at once,but do find that if you have more than one on the go there is always something to do while waiting or saving to buy metal etc.
I am still working on the Edwards 5 radial engine but collecting data for the Lanz.
I review the metal requirements against the stock available. I like to have or locate a source for any hard to find or expensive part before I start
Great minds think alike.
I found I have a couple of bearing and use the closest metric or imperial I can match.
For the gears:
The Bull gear as specified turns out to be Modulus ~1.36 or DP=18.7 neither a standard. I plan to substitute a pair of 17/50 teeth Modulus 1.5 which gives me practically the same Center-to-Center distance and gear ratio.
Parts 2-14 and 4-27 are to all effect racks, even if made with a circular cross section.
The circular pitch for a Modulus one gear is 3.14 mm NOT 3.5mm
My guess is the the original design needed clearance for using a 13mm OD instead of a 12mm as required by a 10 teeth gear and the fact that the gears are cut wit straight flanks.
Pinion with less than 16 teeth are a bit problematic but these applications move only a fraction of turn as snail pace.
I plan to cut gears as theory mandates.