Simko's Weld Together OSG

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Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Mon Jul 02, 2018 7:04 pm

I was looking for the easy way out because I didn’t feel like making two stands. I did a little searching for ‘tool stands’, ‘tool carts’, ‘tool tables’, and settled on a DeWalt planer stand. They are the perfect height/depth for an OSG grinder, have a pop down caster to allow the cart to move, and are only $144 on Amazon. 👍🏻
EC16E787-7B2E-4877-96F6-7B1DE859431C.jpeg
EC16E787-7B2E-4877-96F6-7B1DE859431C.jpeg (2.56 MiB) Viewed 668 times

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Mon Jul 09, 2018 6:53 am

Updated drawings for improvements we made while building. Also changed quantities and nest for one grinder instead of three grinders. I am sure that someone can come up with a better way to nest the parts and use less steel.
Attachments
2x72grinder_REV4.dwg
(239.29 KiB) Downloaded 128 times
20180228 2x72grinder_REV3.dwg
(192.05 KiB) Downloaded 83 times
Last edited by Simko on Mon Jul 09, 2018 12:19 pm, edited 1 time in total.

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Mon Jul 09, 2018 12:19 pm

REV 3
- Changed Tracking Hinge Bottom hole from 1/2-13 to 3/8-16
- Changed Platen D-Plate wheel mount holes from 1/2" clearance holes to 3/8-16 tapped holes
- Changed 1/4" clearance holes on bottom corners of Left Frame Plate to 5/16-18 tapped holes due to interference of nut with Front and Rear Supports
- Updated quantities to reflect amount for one grinder
- Updated nest for one grinder

REV 4
- Fixed small error on bottom corner holes of Left and Right Frame Plates. I accidentally made the bottom corner holes on the Right Frame plate 0.257 for tapping a 5/16-18 instead of 0.260 for 1/4" clearance. What's .003 between friends.
- Fixed notation on Left and Right Frame Plates which showed the wrong number of 1/4" clearance holes.

Dave Finch
Posts: 2
Joined: Sun Jul 08, 2018 6:09 am

Re: Simko's Weld Together OSG

Post by Dave Finch » Mon Jul 09, 2018 5:55 pm

Hi Simko.
Just read your post about axle mods for the platen wheels and tracking wheel. The issue of side loading the bearings is something a lot of builders seem to have problems with. The issue is that wheels are sold by several outlets with the bearings pressed in but with no spacer fitted between them. A spacer tube should always be fitted between the two inner bearing races. The length of the spacer tube should be just a few thousandths longer than the distance between the two bearing seats. The spacer is bored to accept the shaft and it's outside diameter is such that it contacts only the inner races and not the bore of the wheel body. You must also use correctly sized spacer washers on the outside of the wheel which again must contact only the inner race. With this spacer configuration you can tighten the axle as much as you like and not place any side loading on the bearings.
Hope you find this useful.
Dave

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Mon Jul 09, 2018 7:57 pm

Thanks for the response Dave.

You are absolutely correct, the wheels that we bought from Origin Blade Maker did not have any spacers inside and caused the bearings to side load if tightened to much. We considered making spacers for in-between the bearings, but we both agreed that we wanted to also eliminate the slop of the axle bolt going through the clearance hole in the platen d-plate and didn't want the bearings installed on the threaded portion of a regular bolt.

The shoulder bolts eliminate both of these issues and does not require a spacer between the bearings. After getting the wheels shimmed out with shoulder shortening washers, we took feeler gauges and figured out how many spacers to add to the outside to take up the slop left on the shoulder bolt, but not load the bearings.

We used and assortment of 0.060, 0.030, 0.020, 0.015, 0.010, and 0.005 shims to set the wheels perfectly.

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed Jul 18, 2018 1:51 pm

I took the 3D file down as I haven't had a chance to make the same changes to it as I did the 2D file.

People have been asking for the 3D file, so here it is, but you will need to make both the REV3 and REV4 changes to have the 3D model match the 2D geometry.
20180201 2x72grinder 3D REV2.dwg
(4.61 MiB) Downloaded 77 times

bladesmithereen
Posts: 4
Joined: Mon Aug 20, 2018 6:09 pm

Re: Simko's Weld Together OSG

Post by bladesmithereen » Tue Aug 21, 2018 12:09 pm

Thank you for all of this. I would be interested in the new file for those spacers.

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed Aug 22, 2018 6:33 pm

bladesmithereen wrote:
Tue Aug 21, 2018 12:09 pm
Thank you for all of this. I would be interested in the new file for those spacers.
The as-built spacer drawings are in the Rev 3 or Rev 4 drawings about five posts back in this thread

👍

tap1996
Posts: 1
Joined: Tue Sep 04, 2018 11:08 am

Re: Simko's Weld Together OSG

Post by tap1996 » Tue Sep 04, 2018 3:48 pm

I saw on another post that you said you were thinking about getting the 30 pound gas piston, did you end up getting that weight or a higher strength?

Simko
Posts: 16
Joined: Wed Jan 17, 2018 2:03 pm

Re: Simko's Weld Together OSG

Post by Simko » Wed Sep 05, 2018 5:00 am

tap1996 wrote:
Tue Sep 04, 2018 3:48 pm
I saw on another post that you said you were thinking about getting the 30 pound gas piston, did you end up getting that weight or a higher strength?
The 30# gas shock in the 'middle' position works perfect! Middle is in quotes as there are an even number of holes so there really isn't a middle position. :lol:

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