Workholding with Threaded Inserts

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Claudio
Posts: 26
Joined: Wed Nov 13, 2013 12:48 pm

Re: Workholding with Threaded Inserts

Post by Claudio » Mon Feb 17, 2014 9:50 am

cvoinescu wrote:Wonderful! It's very close to what I had in mind when I suggested a two-layer version. Are the zinc parts cams? If so, how are the dowels attached to the T-slot extrusion?
Thanks!

Yes, I used cams to attach the lower wasteboard to the extrusion. The dowels that came with the cams where designed to be screwed into wood. I first was thinking to put an M5 thread on them but in the end I found a simpler solution: I just used M4x25 soket head cap screws instead of the cams. The screws are attached to the extrusion using a washer and an M4 nut whit two sides slightly filed down.
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cvoinescu
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Re: Workholding with Threaded Inserts

Post by cvoinescu » Mon Feb 17, 2014 1:03 pm

Neat, thank you. I have a few M4 insertion nuts, so I don't have to file hex nuts. :)
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

billtrondsen
Posts: 2
Joined: Tue Feb 18, 2014 3:35 am

Re: Workholding with Threaded Inserts

Post by billtrondsen » Tue Feb 18, 2014 4:46 am

Great Video Editing and Scripting! It is enjoyable and educational to watch.
I am still in the dark ages screwing my workpieces down to the waste board - soon to upgrade using your insert concept!

You might be interested in trying Inkskape Gcodetools plug-in.
I use this for V-engraving and it has reduced my work sequence significantly since Inkscape can directly generate the G-code - no CAM required.

Cheers - BillT

JohnA
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Re: Workholding with Threaded Inserts

Post by JohnA » Tue Feb 18, 2014 11:44 am

I did this over the weekend - or at least the area of the bed that I could reach without disassembly (I'm lazy....)

Image
Drilling counter-bore holes - Shapeoko Wasteboard by jabella, on Flickr

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Shapeoko Wasteboard Inserts - Done by jabella, on Flickr

And then I realized I'd need some hold downs as well, so went with the same idea as your video:

Image
Temporary Shapeoko Workpiece Mount by jabella, on Flickr

Image
Shapeoko Hold-Down Test by jabella, on Flickr

Image
Shapeoko Hold-Downs - Completed by jabella, on Flickr

Seems to work great! One of these days I'll do more holes, but this is enough to get me started....

faulty
Posts: 3
Joined: Wed Nov 26, 2014 2:59 am

Re: Workholding with Threaded Inserts

Post by faulty » Mon Dec 29, 2014 9:02 am

Inspired by Winston Moy's video, I did something similar but I can't get hold of threaded inserts locally. I end up using M5 flanged nut from underneath. It's a tight fit and I actually needs to screw a M5 bolt from the top to bring the nut fully flushed.
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Dhpenner1
Posts: 97
Joined: Fri Sep 19, 2014 1:30 pm

Re: Workholding with Threaded Inserts

Post by Dhpenner1 » Mon Dec 29, 2014 5:35 pm

Claudio wrote:
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Where did you get that blue mat on your table?

Damin69
Posts: 331
Joined: Fri Oct 31, 2014 3:00 pm
Location: Muscoda, WI

Re: Workholding with Threaded Inserts

Post by Damin69 » Mon Dec 29, 2014 7:08 pm

What I did for my waste board on the new expansion was a base 3/4" Baltic Birch then topped with a 3/4" MDF waste board and the drew out a 3" x 3" grid then I drilled out every other hole on the backside I counter sunk with a forestner bit just enough to flush up all the 1/4-20 Tnuts I embeded from the bottom of my waste board. that left me a bout 3/8" to be able to shave off for surfacing my waste board as needed.
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Lionshead
Posts: 9
Joined: Mon Sep 29, 2014 3:56 pm
Location: Spokane, WA

Re: Workholding with Threaded Inserts

Post by Lionshead » Tue Apr 07, 2015 5:43 pm

(a year later I catch up)

I'm using threaded inserts without the flange. They're only about 1 cm tall, so I set them flush with the bottom of the wasteboard and get a couple mm clearance. This way I won't have to worry about endmill strikes.

RaymondOverman
Posts: 50
Joined: Tue May 20, 2014 8:13 pm

Re: Workholding with Threaded Inserts

Post by RaymondOverman » Fri Apr 10, 2015 2:19 pm

I have a 1" 8 TPI tap and thread box like this one from Highland (http://www.highlandwoodworking.com/manu ... 26tpi.aspx) that I used to make one off and disposable chucks for my wood lathe. Instead of buying the inserts, I drilled holes in the waste-board and tapped them, I make my hold downs with cut offs from a broom handle. No worries about catching metal with a bit, no dis-assembly of inserts or t-nuts required when changing the waste board and no cost when I need another hold down in an odd place.

It seems to work very well for my purposes. YMMV,
SO2 / NEMA 23s / 5 axis SainSmart BOB and Drivers / DW660 Spindle / Rotary Axis / Spindle-Vac Relay / LimSW / Fender Wells / Drilled and Tapped 1"x8TPI Waste Board

McOtis
Posts: 80
Joined: Sun Feb 09, 2014 12:21 am
Location: Maryland

Re: Workholding with Threaded Inserts

Post by McOtis » Mon Apr 13, 2015 6:13 pm

RaymondOverman wrote:I have a 1" 8 TPI tap and thread box like this one from Highland (http://www.highlandwoodworking.com/manu ... 26tpi.aspx) that I used to make one off and disposable chucks for my wood lathe. Instead of buying the inserts, I drilled holes in the waste-board and tapped them, I make my hold downs with cut offs from a broom handle. No worries about catching metal with a bit, no dis-assembly of inserts or t-nuts required when changing the waste board and no cost when I need another hold down in an odd place.

It seems to work very well for my purposes. YMMV,
Could you post a picture of this setup and/or in practice?
Thanks!

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