USNR Multi trimmer

Issues related to circular saws: benching, tipping, grinding, feeds and speeds, alignment, ....

Moderator: thinkerf

USNR Multi trimmer

Postby A.McRae » Sun Jul 18, 2010 1:16 pm

Hi all,
We have installed a 21 saw USNR multi trimmer in our Drymill.
We have issues with poor finish on the timber and tearout on the corners.we are trimming 3x2 up to 12x2 Radiata pine.
The faster the lug speed the worse the finish gets, to the point of washboarding.
Saws are 22" dia 140tct doing 3316rpm at the arbor.
This machine originally came out of a greenmill operation.
Does anyone out there experiance the same issue?
My gut feeling is we need to spin the saws faster?How much I dont know?
Any correspondance would be much appreciated.
Regards,
A.McRae
A.McRae
 
Posts: 4
Joined: Sun Jul 18, 2010 12:56 pm

Re: USNR Multi trimmer

Postby A.McRae » Mon Jul 19, 2010 5:34 pm

Sorry guys, RPM is incorrect! it is doing 1361rpm and 2609smpm
A.McRae
 
Posts: 4
Joined: Sun Jul 18, 2010 12:56 pm

Re: USNR Multi trimmer

Postby wbsaws » Tue Aug 17, 2010 11:41 pm

Hi A. Mcrae
What is the feed speed of the lumber? This will determine your bite per tooth and how many teeth per minute you need to saw smoothly. Also, washboarding could indicate a lack of clearance angles on the sides( 3 degrees tangential & 1.5 degrees radial are standard ). Also, Top bevel angle,hook and the quality of the grind can all play a part. Use at least 240 to 320 grit diamond.The finer the better
Regards
Tony
wbsaws
 
Posts: 6
Joined: Thu Mar 04, 2010 11:36 pm

Re: USNR Multi trimmer

Postby John M. McCullough » Sun Aug 22, 2010 5:02 pm

Alternate face bevel may help some also.
John M. McCullough
 
Posts: 2
Joined: Mon Sep 28, 2009 7:38 pm

Re: USNR Multi trimmer

Postby A.McRae » Thu Sep 23, 2010 12:18 pm

Thanks guys,
We found that the hold down slippers were still set up for green mill application and the timing in the PLC was set incorrectly.lifting to early etc..
Dropped the height of saws to pass through the cut deeper also.Finish is now very good.
A.McRae
 
Posts: 4
Joined: Sun Jul 18, 2010 12:56 pm


Return to Circular Sawing

Who is online

Users browsing this forum: No registered users and 4 guests

cron