Hello Guest it is April 21, 2024, 07:37:30 PM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - BR549

Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 »
4331
General Mach Discussion / Re: A Power Drawbar Like No Other....
« on: May 17, 2012, 05:17:57 PM »
As a GENERAL rule YES they share the basic geometry.

ON a R8 the drawbar force and the clamping force of a collet are 2 different things. I solid tool holder is easily held with light drawbar force. A collet type on the other hand would slip the tool easily with the same light force you can use on a solid.

To calculate the drawbar force one needs to the know the angle of rotation of the  drawbar, thread pitch and the size and type of steel used for the drawbar. Torque really does not come into play.

The angle of rotation X the pitch tells you the stretch of the drawbar .

Torque is not an accurate way to determene the amount of stretch. Yes it acan get you into the ballpark(;-)

When Dave Dec did his ATC he wanted to KEEP the R8 spindle as a cost option. He modify the Cat30 holder by Regrinding it to the SAME angle as an R8 and used a gripper to pull the holder tight into the taper. BUT that is also NOT a Bridgeport type type spindle he was working with.

I'll look up the Utube page for you.

(;-) TP

4332
General Mach Discussion / Re: m03 floating head programing
« on: May 17, 2012, 04:46:06 PM »
HIYA Ian I see where the confusion is. When I run the G28.1 before the M3 it is already at safeZ .500 as I would NEVER rapid to the next startpoint at pierce hight(;-) A lot of people run Z1.00+ as safeZ JUST to make sure. Then the midpointmove is handy and saves time.

(;-) TP

4333
General Mach Discussion / Re: A Power Drawbar Like No Other....
« on: May 17, 2012, 03:37:05 PM »
A 30 series holder should run at about #800 - 1000 drawbar force.

A r8 collet holder made need a great deal more to hold a tool in the collet for heavy cutting. Solid tool holders require less (;-)

THE drawbar force based on torque is a guess. It depends on thread pitch , friction AND the strength of the drawbar as to generate force it has to stretch to hold force on the toolholder. THere are drawbar force testers made just for that reason. AND it would scare you the amount of force some people put on a R8 collet to attempt to hold the tool from slipping in the collet.

The motor driven drawbar idea has been around for a while as well as the impact method. The motor idea never survived for various reasons. But the impact version is still active.

The standard kneemill with the reduction gearbox on top of the spindle is a bear to get a auto drawbar working dependably. OTHER than the impact method AND that is NOT with R8 collect but with R8 solid toolholders.

A machine like Dave Dec used with a simple one piece spindle is simple to do what he did drawbar wise . Don't think it would work on a Kneemill setup very well.  THE tool holder claw idea worked very well for him and the use of the modified cat30 holders allowed him to GRIP the tool holder with the ATC and get spindle/tool  indexing correct.

AS long as it works, go for it. (;-)

(;-) TP

4334
General Mach Discussion / Re: m03 floating head programing
« on: May 17, 2012, 03:13:23 PM »
HIYA IAN, That.080-  .100 is where the torch spends most of its time when cutting. While it is cutting  the THC does a decent job of regulating the height on warped steel. AS compared to milling where you could be all over in Z height. SO a simple move UP to .500 as a safe Z is minimal movment BUT it gives the torch a chance to reset the TOM safely. COULD be an old habit to always retract to safe Z before ANY functionmove(;-) I can assure you the short move at rapid to Z.500 is not wasting much time and the G28.1 is running at %80 of rapid for the Z .

YES some steels WARP badly when cutting some don't. You can watch the steel warp up when cutting and down as it cools DURING the cuts. USING Scam allows you to use a POST that helps account for warpage by moving the cuts around the table to minimise HEAT build up and warping. We cut anywhere from 20ga to 3/4" plate of various metals. AND that is very wide range for a single table and operator to keep up with. Our auto preset for the THC based on Gcode helps a LOT to keep things striaght settings wise. The OP just has to make sure the OLD torch is set correctly AMP wise and consumables wise. THAT ifo pops up on the screen before each new part is started.

TOO cheap to buy a new modern torch as long as the old one cutts so well. (;-)

I would not consider anything LESS than .500 for a safe Z. AS broken torch couplers at $100 each HAVE proven it is not safe below that point(;-) at least around here cutting guage metals. POPUPS can get you anytime(;-)

AS I remember the G28.1 has ALWAYS did the move to midpoint at rapid speeds and the secondary (homing) move at % of rapid as defined.  WHere does it says the midpoint is done at feedrate? 

(;-) TP


4335
Remove the Z belt cover (2 screws) then use a large straight screwdriver to back the belt sprocket(spindle side not motor side)  up to unstick the Z axis. (;-)

A wise fellow would wire the first switch  to limit/home and the top switch as ESTOP it is really hard on them to jamb the z all the way up. ASLO very agrevating.

Benn there many times before the Estop conversion as MACH is not always keen on stopping on home switches EVERY time. (;-)

(;-) TP

4336
WITH a bridegy the table itself should move backwards to the jog controls. The quadrants are based on tool tip movement not table movements.

From a front left Zero/Zero  IF you push the X pos jog key the "table" moves left. IF you push the Y pos jog key the "table" moves towards you

Just a thought, (;-) TP

4337
Show"N"Tell ( Your Machines) / Re: Adding a 4th axis to my mill
« on: May 17, 2012, 12:10:13 AM »
HIYA RANDY we put a little more load on the systems than a 4th drive would.  OVER 20 hp and 13000 rpm shaft speeds (;-) Have not broken a belt yet BUT have stripped our fair share of  teeth off the belts over the years.

You used to be able to get the tooth design drawings from GATES. I have the 8mm series of the HTD. BUT they hold the new GT2 series TIGHT and you have to KNOW someone to get a copy to cut a new set OR LEASE/BUY the hobbs from GATES(;-).

WHAT you see in the latest CAD drawings is a generic profile.

Please keep us posted as to what you learn. I am all for learning something new. (;-)

(;-) TP


4338
Show"N"Tell ( Your Machines) / Re: Adding a 4th axis to my mill
« on: May 16, 2012, 11:13:31 PM »
Look at the drawing in the patten app. Notice the air spaces between the tooth and the sprocket. With the Height of the tooth that space is required to reduce the friction on the belt as it slides in and out of the sprocket form. The Gt2 is a derivative of the older HTD and is a modified curvelinear design with MORE contact angle on the circular tooth than the old HTD but not as much as a trap design.

Minimum Backlash is a relative term(;-) Yes it IS less than the HTD that it replaced

Just my experience, Your milage may vary

(;-) TP

4339
Show"N"Tell ( Your Machines) / Re: Adding a 4th axis to my mill
« on: May 16, 2012, 03:54:00 PM »
I would use the trapezodial profile if you want tight backlash tolerance from the drive. I use the Gt2 profiles for Kart racing final drives and they are not as tight on backlash as one would want for a 4th axis drive.

Just My experence here your mileage may vary due to local conditions,

Just a thought, (;-)

4340
General Mach Discussion / Re: m03 floating head programing
« on: May 16, 2012, 02:51:33 PM »
hIYA Ian I was just pulling your leg(;-).

The G28.1 method uses a % of rapid as defined in Config/homing. It IS adjustable.

Also with the G28.1 function there IS a waypoint feature. With this you can direct the Z to move to the way point at rapid then finish the function at home speed.  With Plasma you are rarely anywhere but a  0.100 " or so off the top of material at any time. So I just do

G28.1 Z.500   That sends the Z UP to .500 at rapid as a SAFEZ and then resumes the Home function at the preset speed I have defined.

I use SafeZ as .500 as it is not safe to go zooming around the thin guage material as it warps and there may be kickups hidding that will tear the torch right off the head IF you are just skimming the top of the material.

BUT the G28.1 method does NOT allow you to use the G68 function(EXTREMELY USEFULL IN PLASMA) as the Z homing routine will not run in rotated XY space. Yes I know it does not make sense NOT to be able to HOME the" Z".   XY I understand as that is what is rotated BUT it is what it is.

(;-) TP


Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 »