Simko's Weld Together OSG

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Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Simko's Weld Together OSG

Post by Simko » Thu Feb 01, 2018 7:03 pm

A friend and I have been getting into knife making and decided that we wanted 2x72 grinders. After doing some searching and finding prices around $2000, we decided to try and build our own. We were originally going to reverse engineer a Beaumont from pictures, but after doing some searching I stumbled on this website.

I love the design, but I wasn't excited about all of the drilling and tapping... then I saw the weld together version that Kevin Powers posted. I was hoping to get a copy of his weld together prints, but it doesn't look like he is active on here any more.

I decided to start with the Steve Rice Rev2 prints and convert them for welding:

- All of the tabs are shortened by 1/8" to give some surface area to weld
- Front and rear hinge plates were redesigned similar to how Kevin did it, but with more areas to weld
- Converted tracking arm for gas shock. i stretched the pivot point 4" back and 1" up like Kevin did, but that is the end of the similarity.
- Converted the top spacers to be one bolt spacing longer and added shock mount holes to one of the spacers.
- Stretched the top of the arm and added a row of shock mount holes
- The shock is a standard McMasterCarr part and the spacing was selected to have 3/4" of compression and about 1-1/4" of extension when the shock is vertical.
- I spec'ed quick disconnect ball sockets for the shock so that it can be quickly moved from one ball stud to the next. Mount it vertical furthest away from the pivot for full pressure or at an angle close to the pivot for less.

I am hoping to cut these out on my plasma table soon. It's not going to be as pretty as all these laser or water jet builds, but the price is right 8-)

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Brian Stucker
Posts: 5
Joined: Wed Jul 12, 2017 6:01 pm

Re: Simko's Weld Together OSG

Post by Brian Stucker » Sat Feb 10, 2018 4:54 pm

How did it work out for you?

Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Mon Feb 12, 2018 6:30 am

I cut out three sets of plates over the weekend. Even with taking the time to figure out how much to oversize the slots to make up for the taper of the plasma cut, I still had to do some hand filing in the slots and in the tab inside corners to get everything to fit nicely.

Getting ready to drill all of the holes. I was originally going to plasma peck the hole locations and drill them out on a drill press, but my father-in-law showed interest in a grinder (the reason that we are making three now instead of two) and he has a tool and die shop and is going to do them on a CNC mill. 8-)
Last edited by Simko on Thu Feb 22, 2018 7:10 pm, edited 1 time in total.

srice
Posts: 22
Joined: Tue Aug 22, 2017 6:23 pm

Re: Simko's Weld Together OSG

Post by srice » Wed Feb 21, 2018 7:02 am

Life continues to get in the way of my build and I still haven't cut my parts out. I have been considering converting to a tab and slot weld together design as well. I like the idea better than a bunch of threaded fasteners and with the tab and slot design, the amount of heat/weld needed to hold everything together can be minimized. I am thinking about making the arm spacers as a single flat pieces instead of multiple pieces on edge. Is there a reason you kept the multiple piece spacer design?

Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Thu Feb 22, 2018 7:07 pm

srice wrote:
Wed Feb 21, 2018 7:02 am
I am thinking about making the arm spacers as a single flat pieces instead of multiple pieces on edge. Is there a reason you kept the multiple piece spacer design?
I actually changed to solid aluminum spacers instead of the stacked pieces, but I haven't uploaded the files here, because it didn't seem like anyone was interested. I have a build thread going on on PlasmaSpider

http://plasmaspider.com/viewtopic.php?f=6&t=25026

My father-in-law just finished machining the aluminum spacers today... 8-)
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Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed May 16, 2018 7:25 am

Finally made some progress on this project. It has been a long time coming, but projects priorities change when they’re not at the top of the honey-do list. :lol:
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Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed May 16, 2018 1:33 pm

Latest CAD files :twisted:
Attachments
20180201 2x72grinder 3D.dwg
(4.61 MiB) Downloaded 24 times
20180228 2x72grinder_REV2.dwg
(204.31 KiB) Downloaded 22 times

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admin
Site Admin
Posts: 119
Joined: Wed Jul 05, 2017 8:03 am

Re: Simko's Weld Together OSG

Post by admin » Wed May 16, 2018 2:53 pm

Wow, you've been a busy man!

Love it.

Any issues that you encountered?

Dan

Simko
Posts: 8
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed May 16, 2018 7:25 pm

admin wrote:
Wed May 16, 2018 2:53 pm
Wow, you've been a busy man!

Love it.

Any issues that you encountered?

Dan
Issues so far...

1) Plasma cutting tab/slot construction sucks even when you try to take into account for the edge taper. Each grinder had quite a bit of hand filing to get all of the tabs/slots to fit. Water jet or laser would of been nicer, but seeing as how I have a CNC plasma table...

2) The bolt heads for the frame spacers in the bottom corners of the left and right frame plates interfere with the front and rear support preventing the grinder from going completely vertical.

3) The curved slot on the front hinge mount needs extended to allow the grinder to go completely vertical it’s short by about 3/32.

4) The front and rear supports needed to be stretched up for the 3HP motor. I had originally also stretched up the gussets, but I found a collision in the model between the gusset and the motor wiring box.

5) I believe I had to increase the clearance hole for the motor and stretch the bottom of the frame plates down about 3/4” so that there was still some meat there.

6). The 3D model provided by WEG for their 3HP motor does not show a small extension at the shaft end of the foot mount. 1/2” needed to be cut off of the foot mount to not hit the frame plate when the motor was installed.

7). I believe I made the aluminum bars longer than recommended based on what it looked like in the model. I haven’t put a belt on it yet to see for sure.

That’s about it so far.

JeanYves Samson
Posts: 1
Joined: Thu Sep 14, 2017 4:58 am

Re: Simko's Weld Together OSG

Post by JeanYves Samson » Tue May 22, 2018 4:15 pm

Hi! Do you have one kit for sale ( not welded and without all aluminium )... Thanks! :?:

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