CNCzone.com-The Largest Machinist Community on the net!



Home Page Mark Forums Read Today's Posts My Replies Classifieds Reviews Photo Gallery Web Links Share Files Advertise With Us Ad List
Go Back   CNCzone.com-The Largest Machinist Community on the net! > Electronics > Gecko Drives


Gecko Drives Discuss all Gecko drives here and get direct support!


This forum is sponsored by:

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Ban this user!
Old 11-21-2004, 03:16 AM
drk drk is offline
 
Join Date: Oct 2004
Location: india
Posts: 79
drk is on a distinguished road
Step frequency

Hi, I recently changed my motors from steppers( i ran them with my self made L297, L298 driver) to some old iron core type electrocraft motors ( 60V, 16ozin) and used Gecko 340 s for that.
The encoder are renco with 500 lines ( 2000ppr after quadrature). The machine im retrofitting with these motors has a 22mm ballscrew with 5TPI.

My question to you experts is that :

1.To achieve a linear travel speed of 100-400 inches a minute, what should be my step signal grequency range.

2. With geck drives, there is no nee for tacho feedback, so while the drive makes sure that the difference between the no of pulses sent ( step signal) and those received from the encoder are the same ( position reached) what parameter controls the time the motor takes to reach the desired position and the motor speed at which it shall rotoate, is it the voltage??

Thanks
Tweet this Post!Share on Facebook
Reply With Quote

  #2  
Old 11-21-2004, 08:08 AM
ger21's Avatar
Community Moderator
 
Join Date: Mar 2003
Location: Shelby Twp, MI....USA
Posts: 19,570
ger21 is on a distinguished road
Buy me a Beer?

It depends on what you set the step multiplier to. If set to 1, you need 400 inches divided by 60seconds, times 5 tpi, times 2000 steps per turn, which is 66,666 Khz. Set the multiplier to 2 and you'd only need half that. I think this is right.

No, not the voltage. The software controller (Mach2, for example) has settings for acceleration, and sends that information to the Gecko's based on the programmed feed rates and distances moved.
__________________
Gerry

Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html

(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Tweet this Post!Share on Facebook
Reply With Quote

  #3   Ban this user!
Old 11-21-2004, 08:41 AM
drk drk is offline
 
Join Date: Oct 2004
Location: india
Posts: 79
drk is on a distinguished road

Thanks, I just hope my microcontroller is able to generate a good enough waveform at that high a freq.
Tweet this Post!Share on Facebook
Reply With Quote

Reply




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chatter gabeless Hard and High Speed Machining 10 07-14-2005 12:09 PM
Ametek motors and step down ratio dowling177 Servo Motors and Drives 5 03-01-2005 01:24 PM
step angle question?? kywoodwrkr DIY-CNC Router Table Machines 7 02-22-2005 11:04 AM
Dirction / Step lines! bigal TurboCNC 2 02-06-2005 02:51 PM
Choosing a step rate? Rhodan General Electronics Discussion 4 04-26-2004 10:42 AM




All times are GMT -5. The time now is 09:04 PM.





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2012, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO
Template-Modifications by TMS

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