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Colchester toolpost help

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Steve King 511/03/2019 22:06:49
35 forum posts
64 photos

Hi all

I have a Colchester toolpost but unfortunately I have no tool holders. I'd like to make some but due to its design I can't easily get an accurate measurements from the toolpost it's self. I've attached some pictures that I've found on line. If any one has this toolpost, could I get some dimensions of your tool holder please.

Thanks

Steve

3028-quick-change-toolholder-toolpost-side.jpg5063-colchester-toolpost-turned-round.jpg

Bob Astill14/03/2019 11:45:16
avatar
59 forum posts
9 photos

Alan Pearce has just done a great series of videos on just this in several designs well worth a look

Bob

https://www.youtube.com/watch?v=O3eNGRVMYaU
Jeff Dayman14/03/2019 13:17:31
1470 forum posts
37 photos

Steve, is it the dovetails you are having trouble measuring on the existing toolpost? If so have a look for an article in MEW recently by Jaques Maurel about measuring angles. He has shown a neat pin and plate jig to help measure angles accurately, and it is really simple to make. It will allow high accuracy measurement of the dovetails.

Steve King 514/03/2019 16:47:33
35 forum posts
64 photos

Bob Astill

Thanks iv just subscribed to his channel.

Jeff Dayman

The problem I have is that one side of the dovetail on the tool post has 2 angles so it's quite difficult to get a good measurement.

See attached.

screenshot_20190314-163824_gallery.jpg

Jeff Dayman14/03/2019 18:48:19
1470 forum posts
37 photos

Hi Steve, Thanks for the sketch, it clears things up a bit.

Attached sketch below shows how the angle positions could be measured using Mr Maurel's jig and a modified version of it to establish the angled face locations. Hope it helps.

Note that in each case the pins are screwed to the plates to make the jigs easier to hold in use, and the plate edge is back from the pin dias to ensure you are measuring from pin face as intended, not plate face or edge.

toolpost-meas-angles-position.jpg

Steve King 514/03/2019 20:20:34
35 forum posts
64 photos

Very interesting Jeff I would have never thought of that please see attached a picture a friend send to me when I asked advice on the same issue his name is Everett and he has a YouTube channel called Everetts workshop very nice chat always happy to help definitely worth checking him out.

screenshot_20190314-185520_gmail.jpg

Jeff Dayman16/03/2019 15:28:00
1470 forum posts
37 photos

Hi Steve, just fyi if you wanted to read Mr Jaques Maurel's full article on measuring dovetails it is in ME 4588 june 2018, starts pg 842. Couldn't find it earlier this week in my mag stash, but did today.

Edited By Jeff Dayman on 16/03/2019 15:29:04

Edited By Jeff Dayman on 16/03/2019 15:29:43

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