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Author Topic: Crusarius’ sawmill build - started with Linn Lumber basic kit  (Read 7131 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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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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Offline Crusarius

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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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