The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

FARMA


Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Baltic Abrasives Technologies Nyle Kiln Dry Systems




Author Topic: Fabtek 4roller on jd490, measuring problems  (Read 597 times)

0 Members and 1 Guest are viewing this topic.

Offline dcress

  • member
  • *
  • Posts: 7
  • Location: Ontario, Canada
  • Gender: Male
    • Share Post
Fabtek 4roller on jd490, measuring problems
« on: April 13, 2019, 10:24:01 PM »
I have a John Deere 490 with a fabtek 4roller head, shes old buy gets the job done. 

It seems to work fine on pulp, when it comes to 16ft it's all over. Rebuilding the feed rollers, sharpening the knives, helped. 
 
Any ideas or advice would be greatly appreciated. 

Best solution I've come up with is to make a jig 



Thanks

Offline barbender

  • Senior Member x2
  • *****
  • Posts: 6337
  • Age: 43
  • Location: Deer River MN
  • Gender: Male
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #1 on: April 13, 2019, 10:53:58 PM »
I don't know how the measuring system is set up on those, but I suspect they are a measuring wheel and encoder system. Check for loose bolts, broken springs, and that the teeth on the wheel are in good shape. After that go into the electrical😊 If it works good on small stems but not on bigger diameter stuff I would suspect something mechanical.
Too many irons in the fire

Offline Southside

  • Senior Member x2
  • *****
  • Posts: 4402
  • Age: 46
  • Location: Wilsons (Dinwiddie County), VA
  • Gender: Male
  • Have a plan to saw every log you meet.
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #2 on: April 13, 2019, 11:06:03 PM »
I have the same machine.  Does yours have the independent measuring wheel in the center of the head frame or just measure from the rollers themselves?  Which computer do you have? I do have the books for mine and it measures off the rollers, so I can look and see what calibration options exist.
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.

Offline dcress

  • member
  • *
  • Posts: 7
  • Location: Ontario, Canada
  • Gender: Male
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #3 on: April 14, 2019, 12:11:46 AM »
It has the proximity switches in the roller. I have the manual. Just rebuild most of the rollers, I tried it on some birch and it seemed to work fine. I'm thinking maybe the teeth are too aggressive on the measuring roller, when cutting softwood the build up on the longer logs could be throwing it off.

Tomorrow I'm going to change the wheels around and see if it helps. 

Online wannaergo

  • Full Member x2
  • ***
  • Posts: 183
  • Age: 26
  • Location: UP
  • Gender: Male
  • Work while I'm young, sleep when I'm dead!
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #4 on: April 14, 2019, 07:12:10 AM »
Is there a chance your calibration is off? When we had our 4 roller, if it was messed up it could be close on shorter wood, but the longer the log, the farther off it would be
2016 Ponsse ergo 8w
2014 Cat 564
Husky 385

Online Skeans1

  • Senior Member x2
  • *****
  • Posts: 1079
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #5 on: April 14, 2019, 08:28:43 AM »
When cutting out to 40s we would calibrate the independent wheel out to 25 or 27 to find your center. The number you adjust is your center skew the smaller the number the longer the length and vise versa. What sort of lengths are you trying to run? Also when running the long lengths we didnt use the feed wheel encoders unless the bark was slipping you could look at all three measurements to see if it looked right. 

Offline Riwaka

  • Senior Member
  • ****
  • Posts: 448
  • I'm new!
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #6 on: April 14, 2019, 06:05:39 PM »
How difficult is it to put a fabtek center measuring wheel on the head?
Fabtek    (parts)

Do the track motors have enough oil flow to run a chain saw/ disc saw bunk off the 490s track motor oil feed. (put some grapple arms on the fabtek head. ) (i.e use the head to delimb a pile. then saw a bunch at a time to length & stack/ pile)

See if cypress/ axis have converted any fabteks to their system.
CYPRESS ROBOTICS - Taking over the world, one processor at a time.


Offline dcress

  • member
  • *
  • Posts: 7
  • Location: Ontario, Canada
  • Gender: Male
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #7 on: April 14, 2019, 08:36:15 PM »
Only going to 16ft, there is a lot of  oversize that either pushes the limit of the machine or has to be cut by hand. 

 Calibrating by changing the length settings sorta helps,  the medium to large logs measurements aren't consisten enough to trust the computer.  



Online Skeans1

  • Senior Member x2
  • *****
  • Posts: 1079
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #8 on: April 14, 2019, 10:12:27 PM »
Only going to 16ft, there is a lot of  oversize that either pushes the limit of the machine or has to be cut by hand.

 Calibrating by changing the length settings sorta helps,  the medium to large logs measurements aren't consisten enough to trust the computer.  
Is the independent wheel arm hole open in the tower of the head? One thing I do remember running the feed wheel is diameter could change the distance on long wood, a short say 17 we never saw an issue. Are you running short or long on the measurement?

Offline dcress

  • member
  • *
  • Posts: 7
  • Location: Ontario, Canada
  • Gender: Male
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #9 on: April 15, 2019, 11:39:55 AM »
The hole is closed and it measures long. 
Just have to adjust the length for the bigger logs for now. 7inches less seems to work. 

Online Skeans1

  • Senior Member x2
  • *****
  • Posts: 1079
    • Share Post
Re: Fabtek 4roller on jd490, measuring problems
« Reply #10 on: April 15, 2019, 08:23:56 PM »
Sounds like youre out of center if I remember it being called, you should need to go up a number or two to find center. Are both sides coming up the same? If not one of the encoders could be going out.


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Problems with m Fabtek 4 Roller

Started by HansenM84 on Forestry and Logging

6 Replies
1297 Views
Last post April 21, 2019, 01:12:53 AM
by dcress
xx
Measuring DBH

Started by Gilman on Forestry and Logging

12 Replies
5414 Views
Last post May 08, 2006, 09:33:27 PM
by wmrussel
xx
Fabtek 133

Started by Corley5 on Forestry and Logging

106 Replies
14652 Views
Last post May 31, 2013, 08:06:49 PM
by SwampDonkey
xx
Fabtek 133 won't run

Started by lumbertick on Forestry and Logging

30 Replies
3763 Views
Last post January 16, 2015, 10:16:23 PM
by 1270d
 


Powered by EzPortal