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

Nyle Kiln Dry Systems




Author Topic: Dose size matter?  (Read 395 times)

0 Members and 1 Guest are viewing this topic.

Offline JRHD

  • member
  • *
  • Posts: 3
  • I'm new!
    • Share Post
Dose size matter?
« on: January 17, 2019, 12:25:03 PM »
Would you use the same moisture content schedule to dry random width & length 8/4 walnut as you would dimension stock?
8" x 16" x 2 3/8". I get very little h/c in a 30,000' charge of 8/4 but will see 5 to 6% h/c in a charge of 35,000 pieces of the dimension. The dimension pieces are defect free, waxed on both ends, and have sticks every 5".

Offline GeneWengert-WoodDoc

  • Senior Member x2
  • *****
  • Posts: 2654
  • Location: Bishop, GA
  • Gender: Male
  • Author of "Sawing Hardwood Lumber"
    • Share Post
    • Book on Sawing hardwood Lumber
Re: Dose size matter?
« Reply #1 on: January 18, 2019, 03:49:45 PM »
Short dimension pieces have more surface to volume, so they dry faster, which means more risk.  Also, Dimension can have a defect an inch or two from the end, but this defect was cut off.  Overall, this means cross grain at the end of a dimension piece, which again is more defect prone.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline JRHD

  • member
  • *
  • Posts: 3
  • I'm new!
    • Share Post
Re: Dose size matter?
« Reply #2 on: January 18, 2019, 04:26:19 PM »
Thanks for your input. I forgot to mention that in both cases I am talking about walnut.

Offline YellowHammer

  • Senior Member x2
  • *****
  • Posts: 4114
  • Age: 54
  • Location: New Market, Alabama
  • Gender: Male
  • Take Steps to Save Steps
    • Share Post
    • Hobby Hardwood Alabama
Re: Dose size matter?
« Reply #3 on: January 18, 2019, 08:25:20 PM »
As said, the higher the relative surface area, the more forgiving the kiln schedule must be, especially if starting higher than the fiber saturation point.  I dont go as conservative as a 4/4 schedule, but certainly dial it back a little whenever Im drying small chunks, especially high value walnut.  I will also run cooler temperatures, and try to get to the characteristic walnut stall point, then I increase the temps, and then finally drop the wet bulb.  

I assume you are using a steam kiln?

  
HobbyHardwoodAlabama.com

Offline JRHD

  • member
  • *
  • Posts: 3
  • I'm new!
    • Share Post
Re: Dose size matter?
« Reply #4 on: January 22, 2019, 04:58:24 PM »
Yes steam kilns. These charges are pretty green. Usually start in the 70 to 80% moisture range. I start with a 4 degree depression and stay a step behind where 8/4 would be for any given moisture content. These are mostly all plain sawn with little to no figure.  


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
Size does matter

Started by GeneWengert-WoodDoc on Sawmills and Milling

45 Replies
3980 Views
Last post March 05, 2013, 06:19:41 PM
by GeneWengert-WoodDoc
xx
Tell the truth - does size really matter?

Started by malcolmtent on Sawmills and Milling

13 Replies
2630 Views
Last post May 20, 2010, 08:26:48 PM
by malcolmtent
xx
Need Info on LM 2000 > Clutch Shaft Size, Pulley Size, V-Belt Size for 23 HP BS

Started by H60 Hawk Pilot on Sawmills and Milling

5 Replies
2698 Views
Last post October 17, 2009, 07:57:09 PM
by Ironwood
clip
Dose anyone still use these

Started by Alligator on Sawmills and Milling

14 Replies
1580 Views
Last post July 10, 2014, 08:59:43 PM
by Alligator
 


Powered by EzPortal