jason0012

old style 250 pound little giant

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Finally got a front on the hammers gaurd. I still have some work to do on the break and need a latch on the gaurd door, but feel much better with the arms and spring covered( even if they are fun to watch)

20190602_111403.jpg

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This is the spring scatter shield I put on my 50lb. LG. The idea is to first prevent broken pieces from hitting me directly, secondly to have enough give pieces won't ricochet off the back and hammer frame. Lastly being heavy screen I can keep an eye on the spring and watch for signs of potential failure.

How can you SEE if a spring is failing before it cuts loose? The paint WILL flake over cracks and the kinds of stress these springs are under don't cause sudden catastrophic failures, they crack and it grows till it breaks. There is plenty of warning IF you can see it. 

That's the what and why of the shield I put on mine.

The second pic is the brake I put on it and the linkage that make it work. The return spring applies braking pressure and pressing the treadle lifts it free. I needed to make the band longer, I'd like better braking. It'll take a remake of the static band mount, pic 4 and shortening the link rod but that's in the future, it's okay for now.

1180111113_Newspringguard02.jpg.13bfcb646ea6facf1b560e07a659c0dd.jpg         

271478792_Brakeband.jpg.a701e54da358e33b8af329b1ccf763f1.jpg

772962714_Brakeleverandpushrod.jpg.e893609f7328027b088bf4bc084bce86.jpg        

32970930_Staticbandmount.jpg.ff32f549f93bb28e80b6b6e055f4eb1a.jpg

 

Frosty The Lucky.

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That's how I've seen most of the guards on the mechanical hammers. I always like to see the movement to check for problems too. My 30 pound Star doesn't have a guard, not sure the leaf springs need one though.

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In the future I can see replacing the door with an old fire screen that has been hanging around for far too long. I like the idea of hinging in the middle. The gaurd has to be opened to lube the hammer so I do get up close with it a couple times a day- at its age the spring isn't the only part I am watching for failure. I have seen far more failures in little giant arms than springs. Of the dozen or so spring incidents I have witnessed probably 2/3 left the spring intact. I was 30 feet away from a 100 pound that threw its spring once. I think it hit three walls and the ceiling before it came to rest. The scale of these parts leaves me preferring to have them in a cage. Most of my break parts are ready, I will likely try to get them together next week. I am getting more comfortable with this hammer. Forging some h-13 this morning and really appreciating that extra push it has.

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I learned something new about the clutch on my hammer today. First heat of the day had me in a panic that the hammer just would not run. Clutch was tuning and trying, but failing to catch the hammer. I had oiled the hell out of it like I always thought you supposed too. It turns out, these oddball lined clutches dont like oil. After cleaning it off it is back to running. Not a good start to the day though

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On 6/3/2019 at 4:19 PM, Frosty said:

This is the spring scatter shield I put on my 50lb. LG. The idea is to first prevent broken pieces from hitting me directly, secondly to have enough give pieces won't ricochet off the back and hammer frame. Lastly being heavy screen I can keep an eye on the spring and watch for signs of potential failure.

How can you SEE if a spring is failing before it cuts loose? The paint WILL flake over cracks and the kinds of stress these springs are under don't cause sudden catastrophic failures, they crack and it grows till it breaks. There is plenty of warning IF you can see it. 

That's the what and why of the shield I put on mine.

The second pic is the brake I put on it and the linkage that make it work. The return spring applies braking pressure and pressing the treadle lifts it free. I needed to make the band longer, I'd like better braking. It'll take a remake of the static band mount, pic 4 and shortening the link rod but that's in the future, it's okay for now.

1180111113_Newspringguard02.jpg.13bfcb646ea6facf1b560e07a659c0dd.jpg         

271478792_Brakeband.jpg.a701e54da358e33b8af329b1ccf763f1.jpg

772962714_Brakeleverandpushrod.jpg.e893609f7328027b088bf4bc084bce86.jpg        

32970930_Staticbandmount.jpg.ff32f549f93bb28e80b6b6e055f4eb1a.jpg

 

Frosty The Lucky.

Hi frosty, I have had a few mechanical hammers break springs  (3 to date  two 60's and a 150lb) in each case there was not a simple break but the spring broke into multiple pieces some shards much smaller than your guards. holes. I had the hemmer springs wrapped in leather and there was no problem or risk at all...all the shards were contained. I have seen similar spring wraps done with with fire hose .

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Yeah, 1" grizzly screen is the smallest I had or I would've used finer. A leather or canvas wrap would certainly be a better scatter shield and I have no empirical evidence hammer springs fail by increments so the paint flaking may not provide a warning. 

Frosty The Lucky.

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Had some of the local smiths over last night and Steve King drew a few pieces of two inch stock for some nails to be headed at a public demo. The 250 made  really quick work of it.

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Did it load? My browser just shows a black screen with a spinning arrow like it didnt load.

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