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Found 2 results

  1. I posted up an earlier run at this a while back: Even as I was posting it, possible improvements to methods were occurring to me. I have gone ahead and implemented these, with some success. I made seven spoke wheels (with 7mm/in scale 20" outer diameter) this past weekend, at the rate of about one and a half hours per wheel. I think I have gotten this to a true 'production' state. The completed wheels I think are much improved, easier to handle in the finishing stages, and 'finer' in the size of their components. Here are the jigs and tools used in making and assembling the wheels. The jig at the left is for weaving the spokes onto a wheel half. It finally occurred to me to have wife print out something with eight points. However, the eight points, probably owing to distortion in being blown-up from a small original, do not quite align correctly. On this, the notches at the points were adjusted till all the lines crossed precisely over the center dot before the central spacer, of 0.75mm rod, was placed. The jig in the center is to hold the wheel halves aligned when they are attached to the axle/spacer. It began as a weaving jig, but failed in that because I had assumed the points were aligned truly, so that it produced off-center spokes. The four rods of 1mm rod around what was originally a centralizing collar hold the alignment. The center was cut out to give a good view of how the spokes were lining up. The item at the right is the tool for fastening the wheel halves together. Its base is an earlier weaving jig ready to hand for the purpose. A ring off the tubing stock is in the center. Four long pieces of 1.5mm rod are attached and form a guide. The wheel halves, joined already to the axle/spacer, are placed inside. A length of tube then presses down, guided by the rods, and applies uniform pressure to both wheel halves, while the rods preserve external alignment. This item also has the secondary function of holding the wheel halves while their mating surfaces are marked for notching. Here are the pieces employed.... At the top are two raw wheel halves freshly cut from the tube. Beneath these, at the left is a wheel half tinned down and marked for notching, and at the right is a notched wheel half ready to receive spokes. I had tried notching in earlier experiments, but discarded it as it weakened the wheel halves and they bent in assembly, but that was in the early going, and the assembly tool now removes that difficulty. On the near right is a finished axle/spacer, and on the far right is the 'raw' item. A hole is put in a square of 0.75mm sheet, a length of 0.75 rod is put through and fastened. The square is clipped and sanded down till round, and while of greater diameter than the rod, not greatly so. The rod is then trimmed down. It is important one end be longer. Both must be sanded to a bit of a point. On the left is a notched wheel with its spokes. The spokes, pressed into the notches, work to center the wheel half. These are glued in, being sure the spokes are deep in the notch, and the notch filled above them with CA gel. The notches are put in with a knife-edge needle file. Once the wheel half is cut off the weaving jig, an the excess trimmed, the mating surface can be sanded flat with a fine grit sanding stick. The notches fix the spokes firmly enough in place to allow this it very little risk of disturbance. On the right is a wheel half with spokes trimmed, and the wheel's axle/spacer affixed. The short end goes into the lower wheel half. Here is the second wheel half also attached to the axle/spacer, correctly aligned. The longer end of the axle/spacer allows glue to be applied after the second wheel half s aligned, before it is pressed down onto the 'step' of the axle/spreader. Here are the joined wheel halves in the assembly tool. Glue (CA gel) is applied in a manner which avoids the rods. The length of tube is pressed down; it can be held in place between thumb and middle finger, or placed on the bench and pressed down. After a ten count I apply liquid patience, and continue to hold for a slow sixty-count. A Once the 'plunger' is removed, a knife-point will lift the wheel off the base, and it can be lifted out readily. One the left is a wheel fresh out of the assembly tool; on the right is a finished wheel. Finishing consists of clipping the excess off the axle/spacer, and dressing it down with a 'swizzle-stick' sanding stick. Examine the outer rim for un-glued seam, and apply a bit of CA gel smoothed down with a tooth-pick. Sand the outer rim down smooth. Then You can sand down the sides of the tire with a heavy grit sanding stick, keeping it tilted slightly away from the center and the spokes. Though you should not hold the wheel in a death grip, you can hold the center while you do this with reasonable safety. Sand down close to the 'points' of the notches (the dark color of the set CA gel will be visible). Finally, knock down the edges of the outer rim to give the thing a bit of rounding, and end with some smoothing from a fine-grit sanding stick. Here are the weekend's production.... The penny is for scale, and the wheel from an Eduard N.17 kit shows how how undersized these 20" wheels are to the more usual items. It would not be difficult to scale this up to produce wheels of the diameter of that kit piece. At that size, a dodecagon rather than an octagon might be employed, though an octagon would certainly do. At any rate three wheels will be selected from those pictured here for incorporation into a scratch-built model of 'El Somora'.... I will leave you with the contents of the 'swear jar', all the various earlier wheels and attempted wheels which have gone before....
  2. I don't mind confessing this step nearly bounced me off the project, and even now I am still considering improvements that might make the contriving of spoke wheels a more regular process with a smaller ratio of failures to acceptable outcomes. But I have got enough of the bugs out to present a method which can produce acceptable results. The method is derived from routines presented by the late Harry Woodman, master scratch-builder, whose book is available on-line, and highly recommended.... I don't mind confessing this step nearly bounced me off the project, and even now I am still considering improvements that might make the contriving of spoke wheels a more regular process with a smaller ratio of failures to acceptable outcomes. But I have got enough of the bugs out to present a method which can produce acceptable results. The method is derived from routines presented by the late Harry Woodman, master scratch-builder, whose book is available on-line, and highly recommended.... http://rclibrary.co.uk/files_titles/1216/ScaleModelAircraft_Woodman.pdf But his method was meant for 1/48 scale work, and probably (though this is not clearly stated) employed waxed sewing thread for spokes. Adjustments have to be made for work at a smaller scale, and employing monofilament ('invisible thread') for the spokes. The basics remain the same: two circles pressed together to make a wheel, sandwiching between them a spacer representing the axle, and a pattern of spokes attached separately to each circle and, in their centers, to each end of the spacer/axle. This crowns the spokes out as the unit is assembled. Alignments of various sorts are essential, and have to be got at least more or less right. Alignment of the spokes with one another I refer to as internal alignment: Half the spokes are attached to one end of the spacer/axle, and to the mating surface of one of the wheel halves, and the other half of the spokes to the other end of the spacer/axle and other wheel half's mating surface. When the mating surfaces of the wheel halves are brought together, the spoke patterns must be offset from one another, as this provides an optical illusion of more spokes than there actually are which is essential. Alignment of the wheel halve's mating surfaces with one another I refer to as external alignment. Ideally the things should go together precisely --- a small off-set can be made good, but too great a mis-alignment here will show, particularly at the inside where the spokes sprout, a place where the eye will be drawn. Alignment of the spacer/axle also has to be right, or at least to look right. If it is very crooked, and this can happen even if the external alignment is acceptable, the wheel will not look right. Three factors complicate the matter further. First, there is not a lot of 'give' in the monofilament. It must be very strongly attached, both at the rims and the center, and will only stretch a little. Second, the wheel halves are pretty insubstantial. In 1/72 scale they ought not be more than a half millimeter thick, and there should not be more than two millimeters difference between outer and inner diameters, in fact it really ought to be a bit less. This makes bringing them together against the strain of the monofilament crowning out at the ends of the spacer/axle difficult. Third, when cleaning up, after the wheel halves have been attached, care must be taken to keep sanding sticks and knife edges away from the spokes, and the assembly should be held only by the rims, never by the center. Nothing really can be done on the inside seam at all. It is made no easier by the fact that the wheels for 'El Sonora' are much smaller than standard. Wheels of Great War types generally run about 10mm outside diameter in 1/72 scale (or 15mm in 1/48), but the wheels on 'El Sonora' were only 20" in diameter, scaling out to an outside diameter of 7mm. After a good deal of trial and error, which exposed various problems in succession, I finally reached a point where I have been able to produce this weekend a five reasonably usable wheels for 'El Sonora' (which needs three). Here is what is needed for a wheel: The two wheel halves are obvious, the bits beside them are two thin discs made of small slices of 1mm rod flattened down hard in a smooth-jaw pliers, two thin slices of 1mm rod left as is, and a half millimeter disc of of 1.3mm rod ---these make up the spacer/axle and anchors for the centers of the spokes. The octagonal piece is the weaving jig for the spokes, it is 1mm thick. The square pieces, one of white and one of clear plastic, also 1mm thick, with holes in the center, are assembly tools. The tape is used to tack down the ends of the monofilament line at start and finish. The larger sheet of plastic is one means of providing a background against which the spokes can be seen clearly during several steps (they don't call this stuff 'invisible thread' for nothing...)... The wheel halves are cut off the end of a length of tube with a 7mm outer diameter. The suggestion of 'roundness' can be given to the end of the tube before cutting off the ring, and once cut off, the excess can be sanded down to a proper thinness. The ring on the left is finished, the one on the right is straight off the tube. Here a wheel half is on the weaving jig, with the spokes in place. The pencil marks are measured to provide a placement guide for centering, double-face tape sticks the piece in place, the projecting piece of 1mm rod at the center spreads the spokes out. Both ends of th length of monofilament are taped down on the back of the jig. A dab of CA gel is placed between the paired spokes on the rim, and spread to cover them. Care must be taken to keep glue off the inside rim, and it s best to do this twice. Let the glue set ('liquid patience' can be used to ave time, but doing so will make it necessary to replace the double-face tape for each use of the jig). Test by a little nudge with a toothpick to see each spoke is firmly attached. Then clip the lines outside the rim, and lift the half-wheel with spokes off the jig.... Trim the excess monofilament off at the rim, closely (the stuff is very resistant to sanding, so get it right at the edge with the scissors or knife). Place it mating surface up on the opaque assembly tool, prepared with double-face tape, and glue one of the thin flattened discs in the center. Hold over a white surface while you do this, so you can see the center.... Place the wheel half mating surface down on a flat white surface, and glue one of the un-flattened discs of 1mm rod in the center.... Return one of the two wheel halves to the assembly tool, mating surface up, and fasten the half millimeter length of 1.3mm rod to the center disc... Leaving that piece in place, attach the other wheel half to the bit of 1.3mm rod, taking care to off-set its spokes from those of the other wheel half. This is where the magic begins to happen.... The wheel halves are still separated by a bit under a millimeter's distance, however.... Apply glue all around the mating surface of the bottom wheel half, taking care to keep it off the inside rim. Place the clear assembly tool over the upper wheel half.... Squeeze the assembly tool together, doing your best to see the wheel halves come together with their otter diameters closely aligned. You won't always succeed, but about two out of three times the result will be acceptable. Holding the sandwich firmly together for a minute of so will be enough for the CA gel to set. If it looks useable, douse wit accelerator and tend to the seam, thinning down the outsides of the 'tire' a bit as well. I am still mulling over ways to improve the final external alignment. I am thinking that a 'collar' of the tubing, with several lengths of stout rod, perhaps 1.5mm thickness, affixed to the outside of the 'collar', would provide a good resting point for the bottom wheel half, and a good guide for fastening the upper wheel half to the spacer/axle piece, and for pressing it down to mate with the bottom wheel half. Another length of the tubing could be used as a tool to press down the upper wheel half in this step. I expect I will give that a try before I actually put wheels on 'El Sonora', but as I have usable wheels in hand, and know I can do this at the rate of about forty minuted a wheel complete, I consider the problem solved, and now, with wheels and motor in order, I can move to making the airframe.... The aeroplane is 'El Sonora', a Glenn Martin 'Flyer' operated in Mexico starting in 1913. Work on its engine may be found here:
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