astroracer
11-20-2013, 03:14 AM
Doing the SWAG mod to my Harbor Freight tubing roller.
http://www.swagoffroad.com/Harbor-Freight-Tubing-Roller-Electric-Drive-Bottle-Jack-Kit_p_74.html
They say to just mash the 1/2" threading die onto the 3/4" drive shaft for the roller. I want to keep the 1/2" die usable so I designed an adapter to fit the octagon drive bore in the threader. This is an 8 sided bore. Would it have been to easy to make a 6 sided one?
The HF Pipe Threader.
https://static1.pt-content.com/images/pt/2013/11/MVC018Fvi-2.jpg
This is one of the original dies... 8 sides, not 6... Is this a "metric" hexagon?
https://static1.pt-content.com/images/pt/2013/11/MVC019Fvi-1.jpg
I designed the adapter in 3D CAD so it was easy to get good dimensions. I first designed it by cutting 8 chunks of 3/8th's plate but thought it would be easier to assemble if they were all one piece.
We laid out all of the cut lines on a piece of 3/8 x 1 1/2" plate and clamped it to a small angle block.
Doing all of the cutting on the VBS was pretty quick with the layout lines and another block clamped on to guide the initial cut.
https://static1.pt-content.com/images/pt/2013/11/MVC005Fvi-1.jpg
The spacing was .526 inches between the centers of the cut. With all of the cuts made.
https://static1.pt-content.com/images/pt/2013/11/MVC001Fvi-1.jpg
We left about .030 at the bottom of the cut to hold all of the pieces together.
https://static1.pt-content.com/images/noimg.gif
This is the "spindle" for the adapter. I cut a chunk of 1 1/4" dia. steel, cleaned it up in the lathe and bored a .75 hole thru the middle.
https://static1.pt-content.com/images/noimg.gif
https://static1.pt-content.com/images/pt/2013/11/MVC001Fvi-2.jpg
Drilled and tapped two holes on one end, 90 degrees apart, to clamp the adapter to the shaft.
https://static1.pt-content.com/images/pt/2013/11/MVC004Fvi-1.jpg
Used the spindle to form the 3/8th's plate. This wasn't that easy. It took two sets of pliers to do the bending.
https://static1.pt-content.com/images/pt/2013/11/MVC006Fvi-1.jpg
Getting it there...
https://static1.pt-content.com/images/pt/2013/11/MVC008Fvi-3.jpg
The hose clamp pulled it down pretty close but we ended up using a hammer to get it the rest of the way.
https://static1.pt-content.com/images/pt/2013/11/MVC017Fvi-2.jpg
Adjusting the fit. It fit real well on the first try.
https://static1.pt-content.com/images/pt/2013/11/MVC010Fvi-2.jpg
I welded everything up and checked the fit. Did a little clean up grinding and it was good to go. It's not pretty but it will do the job.
https://static1.pt-content.com/images/pt/2013/11/MVC008Fvi-4.jpg
This thing got very hot during the welding but it still fit the shaft and the drive bore with no problems after it cooled.
https://static1.pt-content.com/images/pt/2013/11/MVC013Fvi-3.jpg
I'll end up painting it black but this will do the job and I don't have to destroy the pipe tap from the kit.
https://static1.pt-content.com/images/pt/2013/11/MVC014Fvi-2.jpg
Thanks for looking.
Mark
http://www.swagoffroad.com/Harbor-Freight-Tubing-Roller-Electric-Drive-Bottle-Jack-Kit_p_74.html
They say to just mash the 1/2" threading die onto the 3/4" drive shaft for the roller. I want to keep the 1/2" die usable so I designed an adapter to fit the octagon drive bore in the threader. This is an 8 sided bore. Would it have been to easy to make a 6 sided one?
The HF Pipe Threader.
https://static1.pt-content.com/images/pt/2013/11/MVC018Fvi-2.jpg
This is one of the original dies... 8 sides, not 6... Is this a "metric" hexagon?
https://static1.pt-content.com/images/pt/2013/11/MVC019Fvi-1.jpg
I designed the adapter in 3D CAD so it was easy to get good dimensions. I first designed it by cutting 8 chunks of 3/8th's plate but thought it would be easier to assemble if they were all one piece.
We laid out all of the cut lines on a piece of 3/8 x 1 1/2" plate and clamped it to a small angle block.
Doing all of the cutting on the VBS was pretty quick with the layout lines and another block clamped on to guide the initial cut.
https://static1.pt-content.com/images/pt/2013/11/MVC005Fvi-1.jpg
The spacing was .526 inches between the centers of the cut. With all of the cuts made.
https://static1.pt-content.com/images/pt/2013/11/MVC001Fvi-1.jpg
We left about .030 at the bottom of the cut to hold all of the pieces together.
https://static1.pt-content.com/images/noimg.gif
This is the "spindle" for the adapter. I cut a chunk of 1 1/4" dia. steel, cleaned it up in the lathe and bored a .75 hole thru the middle.
https://static1.pt-content.com/images/noimg.gif
https://static1.pt-content.com/images/pt/2013/11/MVC001Fvi-2.jpg
Drilled and tapped two holes on one end, 90 degrees apart, to clamp the adapter to the shaft.
https://static1.pt-content.com/images/pt/2013/11/MVC004Fvi-1.jpg
Used the spindle to form the 3/8th's plate. This wasn't that easy. It took two sets of pliers to do the bending.
https://static1.pt-content.com/images/pt/2013/11/MVC006Fvi-1.jpg
Getting it there...
https://static1.pt-content.com/images/pt/2013/11/MVC008Fvi-3.jpg
The hose clamp pulled it down pretty close but we ended up using a hammer to get it the rest of the way.
https://static1.pt-content.com/images/pt/2013/11/MVC017Fvi-2.jpg
Adjusting the fit. It fit real well on the first try.
https://static1.pt-content.com/images/pt/2013/11/MVC010Fvi-2.jpg
I welded everything up and checked the fit. Did a little clean up grinding and it was good to go. It's not pretty but it will do the job.
https://static1.pt-content.com/images/pt/2013/11/MVC008Fvi-4.jpg
This thing got very hot during the welding but it still fit the shaft and the drive bore with no problems after it cooled.
https://static1.pt-content.com/images/pt/2013/11/MVC013Fvi-3.jpg
I'll end up painting it black but this will do the job and I don't have to destroy the pipe tap from the kit.
https://static1.pt-content.com/images/pt/2013/11/MVC014Fvi-2.jpg
Thanks for looking.
Mark