John Summers
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Everything posted by John Summers
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Format statements - Non-assigned positions
John Summers replied to Josh T™'s topic in Industrial Forum
If you want to force the + sign, add + to the FS statement FS2 5 1.1ltn+ # Force + with a + sign -
Format statements - Non-assigned positions
John Summers replied to Josh T™'s topic in Industrial Forum
Use a format statement that is NOT FS 1 (the rules are different for FS 1). spaces : 0 FS 5 1.1ltn # Use a format statement that's NOT # FS 1 fmt 5 xout # Use FS 5, but omit the 'prefix' # letter (leave out X or Y...) The method is the same if you're using FS or FS2. -
A 50 foot radius gives no dish at all in 24 in. I have some killer parabola formulas, if you need them. You can enter the 'hump' and get the parabola formula out.
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Set the 24 in. square up on a wedge so everything is 'uphill', and cut it with a fly cutter, from lower to upper. You can use a much larger stepover than with a ball end mill. If you must set it flat, you can cut from the center outward with a bullnose or fly cutter. This leaves a circle in the center to ball mill. This is effectively lead/lag milling, without resorting to 5-axis.
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mpmaster post question
John Summers replied to Chris Wichlaz @ lpmachine's topic in Industrial Forum
That's right Simtech. Since the index (rc5) starts at 1, zero was reserved to find the file size. If your application (-.PST file) fills the buffer first, though, the file size is wc5-1, then the read line would be while rc5 < wc5, ... -
mpmaster post question
John Summers replied to Chris Wichlaz @ lpmachine's topic in Industrial Forum
Try again. Leading spaces are deleted. fbuf 5 1 1 0 ........^ 'save buffer' digit Open the -.TX5 file with an editor. -
mpmaster post question
John Summers replied to Chris Wichlaz @ lpmachine's topic in Industrial Forum
If you add the 'save' bit (bit 2), you can see what you put in your buffer. Just read it with an editor after you run the post. fbuf 5 1 1 0 ^ save bit -
Sorry, I left out a key hint: In order to have the X axis represent 0 degrees in the flat, use CW, -90 to position your work, both in roll and unroll. Another hint: When you unroll several elements, sometimes it appears that they are scattered or disconnected. In the flat, you can translate any unrolled element by one OR MORE circumferences (PI*DIA). You can move or copy. The moved or copied element is still in the same place when rolled.
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If you know the helix angle, just draw a line at that angle thru the origin in the flat, and call TRANSFORM/ROLL. In ROLL, you have to specify the diameter you want to roll the flat geometry on. All geometry at Z=0 in the flat ends up at the specified radius from the axis. If you have to position the line at certain angles around the cylinder, use this relationship: Y /(PI*DIA) = A / 360 If you have a LOT of helixes to construct, or if you get stuck, e-mail me. I'm working on a bulk method.
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If the work is cylindrical, you can do a lot with transform/roll and unroll. If your part is more complex than that, put it up on the FTP site so we can help.
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ROLLDIE.DLL was designed to cut walls that are radial from the centerline. The reason that axis substitution does not give you radial walls is that the rotation angle is figured from the cutter center. ROLLDIE figures the rotation from the drive geometry (the wall). CURVE5AXIS also figures the angle from the drive geometry, but needs a surface, in this case a cylinder, from which it finds a normal, and you have to work in 3d. ROLLDIE can work from either 3d models or unrolled geometry.
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I'm not much help in configuring CAMPLOT, but there is a Mastercam utility CAM.ZIP on the FTP site, that may be even easier to use. It's in Text_&_post_files_&_misc It will probably work even in V7. I'll help if you need it. E-mail me directly.
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The part as designed doesn't match up very well at the turn-arounds. It would work much better without the undercuts. In other words, just use one contour depth in the flat, and use ROLLDIE to cut the part. All elements (rulings) of the ruled surface will be (and should be) radial.
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I couldn't get it to work in X2 or X3, but arc tangent to 3 entities (2 arcs and a point) works OK in V9.
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The part is modeled strangely. It looks like a part that rides on a pin or roller, but the turn-arounds are at an angle. It would have to be cut with a bell cutter (reverse taper) in order to cut it 4-axis. If a pin or roller is supposed to ride on this surface, the contour should be modeled at the pin centerline. ROLLDIE or CURVE5AXIS would be the toolpath choice then.
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I doubt it. There are good reasons not to unroll a surface. Obviously, there are distortions. The surface normals of an unrolled surface would not give a good 'rolled' toolpath. However, you can see the whole surface from one view, and it would be great to machine from the unrolled view. I have just had a little success in a trial program that involved unrolled data. I would like to look at your application [part]. I think some classes of work could work from the unrolled state.
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If you need any kind of accuracy, don't forget to build the surface at mid-stock-thickness.
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MOD = MODULE = 2 NT = NO. OF TEETH = 40 PD = PITCH DIAMETER MOD = PD/NT PD = MOD * NT = 2 * 40 = 80
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A flowline one-way may be a good option for the 'base' toolpath. You have to make a flat surface first.
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I don't see how. The angles needed for the two rotations are a result of some complex math, not easily done in the head. Even if you have the B and C angles, it's hard to visuaize what's going to happen.
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The call to the threading cycle would be made by modifying the post. It should be simple.
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I'm sticking my neck out a bit here. I think you just want to create the 200 points perhaps as a pocket, as if you were milling. Then at each point, call the threading cycle. I'll help if I can. Let's start by establishing the depth of cut for roughing out the groove. Then establish the whole pattern. You can e-mail me directly. Actually, I think you can get away with way fewer than 200 cuts. Are you going to use a round finish tool? What diameter, what depth?
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You need to explain what rotation axes are available, and maybe put you part on the FTP site.
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Sorry, Paul, I should have included WHERE you could look up the OD and ROOT -- Machinery's Handbook. I have a gripe with that, however. The tables for the various types of fit are very complicated, and I think MH left out some words that would help [me] understand the various connections.
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Thanks for your sentiments, guys. I can still help with simple math problems from time to time. John Summers