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! > MetalWorking Machines > CNC Swiss Screw Machines


CNC Swiss Screw Machines Discuss CNC Swiss Screw Machines here.


This forum is sponsored by:

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Ban this user!
Old 03-14-2011, 11:41 AM
 
Join Date: Jul 2010
Location: united states
Posts: 22
tea hole is on a distinguished road
Swiss machine turning threaded stock

A friend and I were discussing some parts and the question was posed how we would individually go about making them. After thinking for a bit, I answered that I'd consider trying a swiss machine if the conditions were right. I've never tried this, but i'm curious. If I had, say, centerless od ground threaded stock of some sort, say Acme or Ballscrew type, is there any reason why one couldn't make one diameter for a bearing on one side, cut a keyway with live tooling, then feed the bar through to turn a similar cut and mill a similar keyway on the other end. Think Bridgeport mill X axis lead screw.

What do you think?
Reply With Quote

  #2   Ban this user!
Old 03-15-2011, 07:30 AM
MikeMc's Avatar  
Join Date: Oct 2008
Location: USA
Posts: 78
MikeMc is on a distinguished road

I have run threaded stock in my Swiss machines. SO the answer for me would bve "Why not?" A few things you would have to consider is the length of the part, the diameter of the part, and the precision of the cuts versus the OD tolerance of the stock.
__________________
www.atmswiss.com
Reply With Quote

  #3   Ban this user!
Old 03-15-2011, 07:57 AM
 
Join Date: Jul 2010
Location: united states
Posts: 22
tea hole is on a distinguished road

for arguement's sake, if the tolerences on the bearing section were, say, +/- .001 leaving material for grind, there is really no reason a swiss couldn't hold that on any given tuesday, and the addition of the threads would add a certain amount of error, but even on a Bridgeport type thread length, at 40 some inches, as long as the sub spindle was thru, there isn't really any reason it wouldn't work, is there. That was my thought, but I've less swiss experience then the opposing party, and didn't want to "talk out my ass" if you will. Maybe I will re-visit the arguement and if all else fails, find a swiss I can borrow to test my theory. Thanks.
Reply With Quote

  #4   Ban this user!
Old 03-15-2011, 09:36 AM
MikeMc's Avatar  
Join Date: Oct 2008
Location: USA
Posts: 78
MikeMc is on a distinguished road

If the tolerance of the bearing section had to be held at +/- .001, and the OD of the thread was +/- .001 then we could easily hold the tolerance of the bearing section. The threads would not really add any error as long as the OD was consistant. "Borrowing" a $200K+ value machine might be an issue.
__________________
www.atmswiss.com
Reply With Quote

  #5   Ban this user!
Old 03-15-2011, 10:23 AM
 
Join Date: Jul 2010
Location: united states
Posts: 22
tea hole is on a distinguished road

My apologies, I should explain.
I am an applications engineer. I have access both at work, and at two different learning institutions if I can give a reasonable explaination as to why I would want to use the machine.
It was a hypothetical part, so I was just *assuming* it would need a high enough surface finish that it may need to be ground. my largest fear was threaded barstock OD consistency causing a binding condition in the guide bushing and/or the bar wanting to thread itself out or back in assuming the machine is a stationary guide bushing machine.

I appreciate your conversation about this subject.
Reply With Quote

Sponsored Links
  #6   Ban this user!
Old 03-18-2011, 03:24 PM
 
Join Date: Jul 2010
Location: united states
Posts: 22
tea hole is on a distinguished road

Originally Posted by MikeMc View Post
I have run threaded stock in my Swiss machines. SO the answer for me would bve "Why not?" A few things you would have to consider is the length of the part, the diameter of the part, and the precision of the cuts versus the OD tolerance of the stock.
I spoke to another apps guy who specializes in swiss and he seems to believe that "you would only get chatter that they've tried before and it didn't work".

Respectfully towards him, I'm not convinced. Without divulging too many particulars, could you clarify what kind of thread you turned and what sort of operations you were doing?

I will be getting a machine in the showroom next month and will try exactly what i'm thinking just to see and let you know how it works for me if you are interested.
Reply With Quote

  #7   Ban this user!
Old 03-18-2011, 03:35 PM
MikeMc's Avatar  
Join Date: Oct 2008
Location: USA
Posts: 78
MikeMc is on a distinguished road

We ran 8-32 threaded rod, and also a small Acme thread. The 8-32 just needed a fine turn from a needle point up to the thread OD about .200" long and a cut off. The Acme thread required a turn, a milled flat, and a cutoff. It amazes me how many things I have done with both cam and CNC Swiss machine that apps guys said I couldn't do. Most apps guys never had to make a profit from actually turning parts on a machine......no offense.
__________________
www.atmswiss.com
Reply With Quote

  #8   Ban this user!
Old 03-18-2011, 04:09 PM
 
Join Date: Jul 2010
Location: united states
Posts: 22
tea hole is on a distinguished road

None taken. I was a machinist for 8 years first. This is my first year in apps. I agree whole heartedly with that as a general statement. Like I said, I agree with you on the turning a thread. I will simply give it a try and either prove he is right, or you are. Simple as that. I obviously put more stock into your word than his (I did check out your company website), no matter how much I respect him as I'm willing to take a (as you pointed out 200k+) machine for a test drive to find out. Some people see things aren't an *ideal* cutting condition and won't even try. I hope to not fall into that. Thanks for the input. I'm glad I found someone who has a different opinion then the "norm".
Reply With Quote

  #9   Ban this user!
Old 03-18-2011, 09:18 PM
 
Join Date: Oct 2009
Location: Canada
Posts: 84
glenthemann is on a distinguished road

I have to agree with Mike, if you can imagine it, then you can do it, dont let anyone tell you otherwise until you prove it to yourself.

If like you said, you had your threaded stock centerless ground then you should have no problems. Centerless ground it should be bang on size throughout the entire length of the bar. There would obviously be a little less inherent rigidity depending on the pitch, but personally I cant imagine any problems if it is not something too large.

I've not done such a thing, but I have had jobs where i needed to produce a fairly long thread which exceeded the guide bushings land where the max major diameter was slightly smaller than the materials od, and I had no problems with it, I just made sure every pass but the final did not skim the crest of the thread so I was rigid. Different application but a similar circumstance.

I cant imagine you having any problems as long as you take it easy, and perhaps even support the part with the sub when you are milling the flat etc. One thing I could think of is if the pitch is so large that your cutoff can fit inbetween crests you could maybe have some issues if it just happens to bite the right way, but I dont have any experience with this off hand I just think its always good to think of potential issues.

Glen
Reply With Quote

Reply

Tags
swiss, threaded rod




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
Turning large threaded rod kendo General Metalwork Discussion 15 04-06-2010 11:09 AM
New to swiss turning, what machine? anemachinebc CNC Swiss Screw Machines 6 10-30-2009 08:38 AM
455 stainless turning on swiss machine ChristianK General Metalwork Discussion 5 04-26-2009 09:19 PM
Swiss Material Requirements for Centerless Ground Stock tejano4life72 CNC Swiss Screw Machines 5 02-17-2009 10:33 PM
New CNC Swiss machines from stock & Rep npkaye CNC Swiss Screw Machines 0 10-02-2007 11:02 AM




All times are GMT -5. The time now is 07:59 AM.





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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361