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

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Chainsawr, The Worlds Largest Inventory of Chainsaw Parts

Smith Sawmill Service



Author Topic: Sawmill build engine question.  (Read 781 times)

0 Members and 1 Guest are viewing this topic.

Offline spottedog

  • member
  • *
  • Posts: 3
  • Location: FINGERLAKES NY
  • Gender: Male
  • I'm new!
    • Share Post
Sawmill build engine question.
« on: February 07, 2021, 09:06:38 AM »
Hi to all I an new here. I am building a mill using 19inch surplus center pulleys and pillow block bearings. I have a 3 inch driven pulley and 14 inch drive pulley. It will have a carriage about 36 inches wide. I have a 16hp vanguard I intended to use but after reading here am wondering if I should go bigger. I have looked at a 18hp vanguard and kohler by the specs the kohler is about 20 pounds heavier. Wondered if anyone was using either and had a preference one over the other.

Offline Patrick NC

  • Senior Member
  • ****
  • Posts: 778
  • Age: 46
  • Location: Casar, NC
  • Gender: Male
  • I'm not new anymore, but still pretty green
    • Share Post
Re: Sawmill build engine question.
« Reply #1 on: February 07, 2021, 09:27:54 AM »
Welcome to the forum. I donít have any answers for you other than get all the horsepower you can. Iím sure there are lots of folks on here that can help you more than I can. 
Norwood HD36, Husky 372xp xtorq, 550xp mk2 , 460 rancher, Kubota l2501, Case 1845 skid steer,

Offline Joe Hillmann

  • Senior Member
  • ****
  • Posts: 960
  • Location: Cameron, WI
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #2 on: February 07, 2021, 11:48:43 AM »
Surplus center wheels have small center holes.  That means small shafts and bearings.  So you will have to keep the pressure on your band a bit lower so you dont break shafts and bearings.  

With low band tension you cant cut very fast without wondering.  So, 16 hp should have more power than your blade can handle and still cut straight.

 I have a 14 hp mill with rubber tires for band wheels that can only handle light blade tension.  I would guess I have milled 2000 or so logs and maybe 5 or 6 of them allowed me to cut at a speed fast enough that the power of the engine wasn't enough.  But on those all I did was slow down the cut a bit.

Offline spottedog

  • member
  • *
  • Posts: 3
  • Location: FINGERLAKES NY
  • Gender: Male
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #3 on: February 07, 2021, 12:07:34 PM »
How big of shaft should I use? I bought 1 1/2 shaft and bushings to fit the pulleys. Linn lumber uses 1 7/16 shaft for there mills so I figured 1 1/2 would be all right. Maybe the stuff they use is different material to take the pressure.

Offline Joe Hillmann

  • Senior Member
  • ****
  • Posts: 960
  • Location: Cameron, WI
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #4 on: February 07, 2021, 05:38:38 PM »
2" is often recommended.  The problem is a band wheel with a 2 inch hole, a 2 inch shaft and 2 inch bearings probably costs $500.    Whereas the same same set up with a 1.5" shaft through surplus center is probably closer to $100.

As long as you don't over tension the blade what you have will be fin.  About 8ish years ago there were 2 or 3 different threads of people who built mills with 1.5" shafts that either kept wearing out bearings or eventually broke/bent the shaft.

If you are building a hobby mill I would go with what you have.  If you are building something you  plan to cut really wide slabs on(+24" cuts all the time) or something you plan to run fast to get lots of production out of then maybe you should consider bigger shafts.

One cheap, middle of the road option may be to buy the wheels with 1.5" center holes from surplus center but use a 2 inch shaft that you have only the last couple inches turned down to fit your wheel holes.  That way you can use bigger bearings and shafts but the much lower cost wheels.

The mill I have is way under built.  Money was tight when I built it and if I were to help someone else build a mill I would have tons of things that I would tell them is wrong with my mill.  But if I were to build it again to day knowing all the things that is wrong with it I would build it the same way I did because it was cheap and built with what I had.(the only place I probably wouldn't cheap out is on the blade guides.

Online JoshNZ

  • Senior Member
  • ****
  • Posts: 824
  • Location: New Zealand
    • Share Post
Re: Sawmill build engine question.
« Reply #5 on: February 08, 2021, 12:15:42 AM »
I built my mill and used 1.5" shafts from memory. Turned from 4140 and I've got taper lock type bearings in the pulleys. It works fine I can run enough tension that the pillows get hot and I've never noticed shafts bending or tracking changing.

As mentioned if I were going to build another I'd go to 2" shafts and the larger type bearings to handle those days you wanna run a butt load of tension.

Offline spottedog

  • member
  • *
  • Posts: 3
  • Location: FINGERLAKES NY
  • Gender: Male
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #6 on: February 08, 2021, 08:38:47 AM »
Thanks for the input. Glad to know it will work although not ideal. I will use what I have for now its not going to be a production mill just for my own use. I was looking at the cooks blade guides, but didn't want to spend that much. I think I am going to buy the wheels and make the rest. 

Offline ajsawyer

  • member
  • *
  • Posts: 29
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #7 on: September 17, 2021, 01:24:00 PM »
2" is often recommended.  
FYI Woodmizer uses 1-7/16" ID bearings for the blade pulleys (LT30/40), per this: 
https://apps.woodmizer.com/Manuals/EngDoc.aspx?man=sawmill%2Fparts%2Fpdf2%2F641.pdf

Offline JRWoodchuck

  • Senior Member
  • ****
  • Posts: 286
  • Age: 36
  • Location: Baker City, Oregon
  • Gender: Male
    • Share Post
Re: Sawmill build engine question.
« Reply #8 on: September 17, 2021, 10:01:16 PM »
I used surplus center 19Ē pulleys with 1 1/2Ē bushings and am pleased with how they work. Definitely get the bushing style pulleys not the bored pulleys they donít handle a sawmill very well. 
Home built bandsaw mill still trying find the owners manual!

Offline JRWoodchuck

  • Senior Member
  • ****
  • Posts: 286
  • Age: 36
  • Location: Baker City, Oregon
  • Gender: Male
    • Share Post
Re: Sawmill build engine question.
« Reply #9 on: September 18, 2021, 12:30:04 AM »
Forgot to answer your question havenít used any of those motors but never heard anyone complain about having more power. 
Home built bandsaw mill still trying find the owners manual!

Offline ajsawyer

  • member
  • *
  • Posts: 29
  • I'm new!
    • Share Post
Re: Sawmill build engine question.
« Reply #10 on: September 21, 2021, 01:27:00 PM »
"About 8ish years ago there were 2 or 3 different threads of people who built mills with 1.5" shafts that either kept wearing out bearings or eventually broke/bent the shaft."

FYI 1018 steel can withstand a 42,000 psi load with infinite fatigue life. Given a cross-sectional area of 1.77 square inches(1.5" diameter shaft), that translates to more than 74,000 lbs of force, over many cycles, needed to deform the shaft through fatigue.

A 1.5"x.042" blade has a cross sectional area of .063 square inches. For a saw with 1.5" diameter 1018 main driveshafts to reach the limit load (42ksi), a 1.5"x.042" blade would have to be under 74,000lbs/(2x.063)=587,300 psi of tension.

I suspect the broken/bent shafts were made of chineseium...


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
New Sawmill Build - what engine - gas or diesel?

Started by JohnnytheFish on Sawmills and Milling

3 Replies
317 Views
Last post October 03, 2020, 02:57:36 PM
by JoshNZ
xx
Sawmill build question

Started by BigZ La on Sawmills and Milling

2 Replies
545 Views
Last post July 17, 2017, 10:32:30 AM
by BigZ La
xx
2 cycle engine for saw build?

Started by vtdiy on Sawmills and Milling

31 Replies
23552 Views
Last post December 17, 2016, 05:01:49 AM
by ozarkgem
xx
chainsaw mill build with lawn mower engine

Started by mike barry on Sawmills and Milling

23 Replies
23557 Views
Last post December 28, 2018, 09:47:11 AM
by CLinLogs
 


Powered by EzPortal