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Author Topic: Crusarius’ sawmill build - started with Linn Lumber basic kit  (Read 15323 times)

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Offline Crusarius

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #180 on: November 13, 2017, 01:23:55 PM »
Here is my preliminary design on my log clamps. I chose to make them spring loaded. I still have quite a bit of work to do but I have the concept in my head. If only I had a print button 
The c-clamp is acting as the back stop while I was contemplating the meaning of life (aka banging my head against the wall in design funk frustration). The piece of steel on the bunk is acting as a piece of wood (it was easier to grab). There is an angled plate on the end of the bunk with the spring connected to that. I had to angle the plate so the spring would to clear the carriage as it rolls past. I am really hoping this is not going to be a problem with how tight my clearances ended up.

The vertical tube on the side is setup for a sliding piece that I am hoping to drill holes in and make a spring loaded pin for quick raise and lower.








The tube against the rail is just temporary while I am proving the clamp concept. The other tube is set into the pocket that will be welded to the clamp. There will be a spike welded to the top of the sleeve as well.






The proof of concept worked out very well. The only thing I am not crazy about is when clamping a light piece of wood the sleeve likes to lift up a little bit. Probably won’t be a problem on a large cant but is definitely a problem on lighter boards. I will probably just drill and tap the bottom of the sleeve and install a nylon bolt to keep it tight. That should allow it to slide freely and not lift.

After playing with it for a while I realized I built it to be left handed. I am not left handed. I have since cut all the tacks and reversed everything to be on the right side. I may have been able to get used to it but trying to twist the chain to go in the slot was kinda challenging.

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Offline Kbeitz

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #181 on: November 13, 2017, 01:42:26 PM »
So your hoping that little spring is going to hold your log ?
Sometime it take a lot of force to hold a log up tight to the
backstops. On a log like this it takes a lot of push.

 

 
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Offline Crusarius

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #182 on: November 13, 2017, 01:44:55 PM »
I was pretty impressed with the holding forces when I was playing around with it. We will see how it works.
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Offline Crusarius

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #184 on: November 13, 2017, 09:12:40 PM »
E-bay has wheelchair motors much cheaper and they come with a gear box.
That looks like a good motor but the RPM's are way to fast. You need something
with low RPM's.
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Offline Crusarius

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #185 on: November 14, 2017, 07:15:12 AM »
I was afraid of getting something to slow and having to take forever for it to move. It would be great if it had 2 speeds. I guess a wheelchair motor is variable.

What Rpm's would you recommend. My threaded rod is 5 turns per inch.
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Offline Kbeitz

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #186 on: November 14, 2017, 09:28:13 AM »
Only you know how fast you want something to move.
Remember more speed less torque. Put a speed control
on your machine and have the best of both worlds.
You can also get them real cheap off E-bay. Just watch
your amp draw when buying.
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #187 on: November 14, 2017, 10:03:30 AM »
The amp draw is definitely a big concern. hate to kill battery going from bottom to top. Especially without a pull start on the engine.

I tested that linear transducer I scored. it runs great on 24 volts plugged into the wall with the transformer. It is really slow on 12 volt straight from a battery. But I was able to lift the corner of the trailer off the ground very easily. I think I may try it for my toe board and see what happens. I am a little concerned it is not really weather resistant so I may need to make an enclosure for it.
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #188 on: November 14, 2017, 10:08:23 AM »
So your hoping that little spring is going to hold your log ?
Sometime it take a lot of force to hold a log up tight to the
backstops. On a log like this it takes a lot of push.

 

 (Image hidden from quote, click to view.)

I will have 4 spring clamps. The spring is not really holding the load. What is actually happening is its holding the piece that slides. That piece is getting cocked and locking to the bar. It is just like a cam clamp without the cam but the spring keeps it locked to the bar.

Kinda hard to explain but that is how other mills cam clamps work. The ones that slide on the bar then they lock into place with a side load.
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Offline Kbeitz

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #189 on: November 14, 2017, 11:19:47 AM »
I used rack for that. I have to lift up to get it to slide.

 

 

 

 
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Offline qbilder

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #190 on: November 14, 2017, 07:43:46 PM »
The spring clamps work just fine and will easily hold any log you're able to handle on that mill. I have a Linn based mill with similar clamps & it's no sweat holding 30"+ diameter maples & oaks.

The electric motor I fear will be too weak. You'd be best using a gear reduction motor. I raise & lower my mill head manually and it's a bear, especially when the threaded rod & brass nuts get gunked up with sawdust. A motor that turns 100rpm would give you 20" of movement in 60 seconds, meaning 3 seconds per inch. While not rocket speed, it's not slow and it will exponentially increase your torque. That reduces the strain of the motor, stretching its life expectancy. Get a 300rpm motor & move an inch/sec.         
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #191 on: November 28, 2017, 02:11:14 PM »
I worked on the clamps and backstops a little more. I started out with this for my backstop left to right adjuster


Then after the concept was proven I moved to this. Believe it or not one of the holes is threaded the other one is just a through hole.


I also added the vertical adjustment point. I used a 3/8” through bolt for the pivot and a ½” for the fine adjustment. The long carriage bolt may be temporary till I get the right length bolt.








All 4 backstops. I did make #1 1” taller than the other 3. Thanks everyone who suggested that.
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #192 on: November 28, 2017, 02:11:53 PM »
Here is the sliding clamp. I am using 3/8” plate with a 45 degree angle cut on the end. I am hoping this will be strong enough so when I drop a log on it, it doesn’t deform to much. You can also see in the picture I started closing up the ends of the bunks to minimize critters and bees nesting.





Top view showing the spring.

 I originally had it so the spring was connected to the plate covering the end of the 2x2 slide piece. When I was showing it off to a friend I found that every time I tried to hook the spring it lifted the board I was trying to clamp. I ended up making a tab to weld to the main rail so the spring cleared whatever I was clamping.





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Offline Darrel

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #193 on: November 28, 2017, 11:15:33 PM »
Looks like some progress is being made. Glad to see that you overcame your obstacles! 8)
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #194 on: November 29, 2017, 07:03:54 AM »
yea. since I pretty much lost my window to be milling this year I slowed down and am taking my time. Hopefully I can do everything right or at least close on the first attempt.
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Offline Georgia088

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #195 on: December 30, 2017, 09:50:39 AM »
Crus,
Have you had a chance to try the clamp out? How did it work? Very neat and interesting design.


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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #196 on: December 30, 2017, 09:39:37 PM »
only testing i have done is playing in the shop. haven't got it cutting anything yet. I am planning to have it ready to go by springtime. today was the coldest i have ever seen in my shop it dropped to 38 degrees f.

Really want to get some painting done so I can reassemble and test everything but can't keep the heat high enough for long enough to do it. I do have some updates on work I have done. Just been to lazy to post them. Maybe I will try to do it tomorrow.
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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #197 on: January 05, 2018, 04:42:16 PM »
So at 25 degrees in the shop I think it may be a little to cold to be out working. I guess it is finally time for an update.

I left off on the clamps. I now have all four of them tacked together in the configuration I think I am going to like. I still need to figure out the vertical sliding piece. Good thing is I have a crazy idea in my head for that.








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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #198 on: January 05, 2018, 04:44:35 PM »
Now to revisit the backstops. I have all of them made and welded to the bed.


The vertical piece is 2x2x.188 wall the large square is 2x6x.188 wall and the small square is 2x3x.188 wall. The bolt on the upright is the pivot for adjusting squareness to the bed. Ignore the extra washers I couldn’t find the right length bolt. It has been fixed since these pics were taken.

The carriage bolt adjusts right to left rotation to align parallel to the bed. The bolt on the upright is the pivot to allow squaring to the bed. With these 2 adjustments I should be able to dial each of these backstops in to be pretty close. And be able to fix it after I smash them with a big log.


The 2x3 is welded to the bottom of the 2x6 bunks. Each of these stops will rotate together for raising and lowering from one end of the mill. That is the reason I had to make them two way adjustable.


Looking down on the backstop.


Looking up inside the backstop. The 1/2” bolt is to adjust the angle of the upright. I know this is going to be quite challenging squaring all four of them to each other. But once done hopefully I won’t have to do it again for a while

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Re: Crusarius’ sawmill build - started with Linn Lumber basic kit
« Reply #199 on: January 05, 2018, 04:47:29 PM »
Last time I put the trailer in the shop I put it in tail first. Up until then everything was being built and figured from the other direction. I finally decided it was time to reverse the trailer since I was sick of welding stuff together backwards.

Don’t forget to ooh and ahh over the awesome set of pallet forks I made just for this project :) they have definitely been more useful than I thought they would be. (this is sarcasm I am not usually this vane just in one of those moods. Thank you please drive through)

The rails on the trailer are 24’ long. I do not remember if the axle was connected in this picture or not. I don’t think it was because it looks to far back. Could be an optical delusion?








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