Compact Bulldog Bone

chewbacca · Nov 7, 2014

I wonder if an XXXL button head cap screw can be found. One whose head diameter matches the width of the aluminum stock. You'd have to cut the threaded shaft down, but you wouldn't need a washer or spacer at all would you?

http://www.diytrade.com/china/pd/6335999/Titanium_Screws_Button_Head_Cap_Screws_ISO_7380.html

macswan · Nov 7, 2014

Not me I rock pfanners and arbortec. no bend in my bone.

Tom Dunlap · Nov 7, 2014

I'm going to find a socket head cap screw and tap the holes to 1/2-NC I'm pretty sure.

http://www.accuratescrew.com/info/SocketRef.aspx

monkeylove · Nov 7, 2014

Tom, if you can buy and tap 1/2-20 instead of 1/2-13 you will pick up an extra thread in the arm. Assuming that the arm is 3/16 thick. Not sure it matters in this usage but just throwing it out there.

TreeLogic · Nov 7, 2014

It is 3/16

TylerHoffman · Nov 7, 2014

Had a good view at work today! The new modification added more comfort when operating the bone. I like it

TreeLogic · Nov 7, 2014

Now that's a Compact Bulldog Bone advertisement right there. Nice pic Hoff.

Tom Dunlap · Nov 7, 2014

ML

Yup...ever little bit helps. On my way home from work I thought of another option. I have some Heli-Coils. This might allow me to use a screw with a special head to become the tab.

One of the best, after treework, jobs I ever had was in college years. I worked for a company that built wide belt abrasive sanding machines. The work I did was to assemble some of the smaller machines. Lots of drilling, tapping, air controls, wiring.

See the blue machines here:

https://www.google.com/search?q=aem...L4yQSuuIGwCg&ved=0CAkQ_AUoAg&biw=1280&bih=672

The job gave me a good understanding of how machines work and how to make adjustments and fabricate.

TreeLogic · Nov 8, 2014

macswan said:
no bend in my bone.

Wish I could say the same

But hey, it works for me :bananahappy:

JTree · Nov 8, 2014

Tom Dunlap said:
ML

Yup...ever little bit helps. On my way home from work I thought of another option. I have some Heli-Coils. This might allow me to use a screw with a special head to become the tab.

One of the best, after treework, jobs I ever had was in college years. I worked for a company that built wide belt abrasive sanding machines. The work I did was to assemble some of the smaller machines. Lots of drilling, tapping, air controls, wiring.

See the blue machines here:

https://www.google.com/search?q=aem belt sanders&num=100&newwindow=1&safe=off&client=firefox-a&hs=h6Y&rls=org.mozilla:en-USfficial&channel=sb&source=lnms&tbm=isch&sa=X&ei=C0ZdVN3-OsL4yQSuuIGwCg&ved=0CAkQ_AUoAg&biw=1280&bih=672

The job gave me a good understanding of how machines work and how to make adjustments and fabricate.

Yeah, I've worn a lot of hats. Best jobs I've had were the ones that taught me a lot.

gmcttr · Nov 8, 2014

The "fix" must be in. I got a shipping notice this evening.

It's going to be a long weekend waiting for the mail on Monday.

macswan · Nov 9, 2014

I have been biting my tongue to see if more details came out and such, but...I really feel like this whole cross loading thing seems like a user error issue.

I will happily admit I am wrong if I get details indicating I am.

I understand and respect Gordon's quick action with trying to correct any sort of defect.

I have been climbing on this thing for quite a while now, and as many can attest I am not one to baby gear, I have never come close to loading it with enough force crosswise to bend the damn thing. I am only speaking from my experience. I jus thought someone had to say it out loud.

Treetopflyer · Nov 9, 2014

I've taken great notice to the possibility of the occurance happening while on rope in use under load and going up down etc .I don't see it happening .I don't believe physics will allow it ..maybe I'm wrong as I often am.. just been watching intently as I use it and to cross those arms would take some doing .

TreeLogic · Nov 9, 2014

I hear you mac. I sorta feel the same way at moments but then end up questioning myself. If you take those arms and try with just hand power you could probably cross load them. We've all been dummies and have done things in the tree we thought would never happen. I think the point is to dummy proof this thing. FWIW

Treetopflyer · Nov 9, 2014

TreeLogic said:
I hear you mac. I sorta feel the same way at moments but then end up questioning myself. If you take those arms and try with just hand power you could probably cross load them. We've all been dummies and have done things in the tree we thought would never happen. I think the point is to dummy proof this thing. FWIW

No doubt better safe than sorry!

surveyor · Nov 9, 2014

The fact that it did happen makes this a serious concern, Please all users that do not have the retro-fit handles/stops, return the bones to me and I will add this fix and send back when modified.

macswan · Nov 9, 2014

TreeLogic said:
I hear you mac. I sorta feel the same way at moments but then end up questioning myself. If you take those arms and try with just hand power you could probably cross load them. We've all been dummies and have done things in the tree we thought would never happen. I think the point is to dummy proof this thing. FWIW

You right, I know you right

TylerHoffman · Nov 9, 2014

oceans · Nov 10, 2014

I like Chewy's thought, and I found some decent bolts. They're available at my local hardware store...metric, with threads running right up to the head, so you only need 1/64" of chamfer on the hole, if at all. Tight thread pattern, so plenty of bite in the thin arm material. Combo pan/hex head, and the "pan" diameter is spot on for the arm dimension. I'll throw up photos once I get the chance (preferably after the mod). It should look "factory", although I already admit the Chewy bolts would look better.

Tom Dunlap · Nov 10, 2014

I found some plastic washers that came as spacers on new chainsaws between the powerhead and side cover in place of the bar. In order to mount them I tapped the BDB to 3/8-NC. After mounting I had to file off part of the plastic washer so that the aluminum bars mated.