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Colchester Chipmaster

Saddle locking Wrench

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Ernest Shirt19/07/2019 22:33:06
5 forum posts

This may sound like an odd request bearing in mind I have owned my Chipmaster for more than ten years. The lock on the saddle is engaged with a 7/16” square bolt to the rear of the saddle and from aquiring my machine I used an old brass stop tap key which has suddenly gone walk about I cannot find it anywhere and I’m wanting to replace it but it is not listed or mentioned in the manual and everyone I have asked about it are as puzzled as I am as no one has ever seen one, could anyone shed any light on this item please.

Regards

Ernest

Brian Wood20/07/2019 11:09:20
1966 forum posts
37 photos

Ernest,

You may have to make one by filing out a square hole in a piece of drilled bar and then welding or brazing a T handle or similar to it.

If you Google square chuck keys all you see are the male versions and looking for hollow square keys only seems to go up to clock winding key sizes, nothing in the size you need..

Brian

Clive Foster20/07/2019 11:33:56
1840 forum posts
59 photos

Ernest

T handle box spanners in 7/16" from Smith & Francis here :- **LINK** . Site has an "expensive" look tho'.

Probably plenty of suppliers if you knew what to search for without getting umpteen million results for square drive sockets.

As Brian says easily made by welding or brazing if you have the kit.

Clive

DC31k20/07/2019 15:40:26
59 forum posts

I do not think Colchester ever supplied a spanner for this.

Whatever you make, it needs to be fairly shallow or it will foul the topslide when it is parallel to the spindle axis.

A good place to start might be a gas bottle spindle key and a file. Older ones appear to have more meat surrounding the square hole.

Ernest Shirt20/07/2019 23:35:42
5 forum posts

Thank you for all your replies and suggestions but I believe I have actually found the supplied tool list for a Chipmaster and now I know what I’m looking for I bet I have pushed them aside looking through second hand tools at steam rallies and model engineer shows. As soon as I found the list it stood out like a sore thumb and made perfect sense it is a combination spanner 7/16 sq. x 1/2” AF and it makes sense as the 1/2” AF is for the two locking nuts on the compound slide swivel... Doh

part number 81-153

again many thanks for all who replied and as a stop gap until I find one I’m going to make a new locking bolt with a 1/2” AF hex head and just use a standard 1/2” combination spanner.

if anyone would like to see the full list just let me know and I will list everything.

Ernest

Edited By Ernest Shirt on 20/07/2019 23:38:10

Edited By Ernest Shirt on 20/07/2019 23:38:39

DC31k21/07/2019 09:42:11
59 forum posts
Posted by Ernest Shirt on 20/07/2019 23:35:42:

...I’m going to make a new locking bolt with a 1/2” AF hex head and just use a standard 1/2” combination spanner.

Before you make the new bolt, try a 12-point 1/2" A/F ring spanner on the existing square bolt. Because of the chamfered corners, it fits with no more slack than a 7/16" A/F open ended.

If the original spanner was 7/16" square x 1/2" A/F, then maybe a drum brake adjusting spanner can be modified to replicate it.

Please post the tool list if you are able.

Ernest Shirt21/07/2019 18:23:52
5 forum posts

The list as requested

81-151 15/16 a/f x 3/4 a/f open end spanner

81-152 9/16 a/f x 11/16 a/f open end spanner

81-153 7/16 sq x 1/2 a/f combination spanner

81-154 15/16 x 11/16 a/f box spanner

81-155 Tommy Bar

81-156 3/8 a/f Allen hexagon key

81-157 5/16 a/f Allen hexagon key

81-158 7/32 a/f Allen hexagon key

81-159 3/16 a/f Allen hexagon key

81-161 1/8 a/f Allen hexagon key

81-262 3/32 a/f Allen hexagon key

that is the complete list for the Colchester Chipmaster and also I believe for some Bantams

 

Regards

Ernest

Edited By Ernest Shirt on 21/07/2019 18:31:27

Ernest Shirt22/07/2019 16:16:47
5 forum posts

Latest update

A very nice young lady from Colchester (thank you Lynnette) has sent me a copy of two manual pages one showing the toolkit items and the second being the list of these items. Please sent me your email if you would like a copy.

Ernest

Stuart Bridger23/07/2019 08:35:21
346 forum posts
17 photos

Call me a heathen, but I have always used a 13mm ring spanner for this function. A bit of a loose fit, but given that not much pressure is required to lock the saddle, it works well enough for me.

DC31k23/07/2019 14:28:03
59 forum posts
Posted by Stuart Bridger on 23/07/2019 08:35:21:

Call me a heathen, but I have always used a 13mm ring spanner for this function. A bit of a loose fit, but given that not much pressure is required to lock the saddle, it works well enough for me.

You can only escape that epithet if you stipulate that it is the Continental model. As any fule no, a 1/2" ring spanner should be used on the imperial machine.

Stuart Bridger23/07/2019 14:41:25
346 forum posts
17 photos

My Chippie has dual dials, does that count

Ernest Shirt23/07/2019 15:53:19
5 forum posts

If we are getting personal mines an hermaphrodite it’s fully DRO but it’s still got imperial nuts and as far as I’m aware even a metric chippy is imperial in everything but it’s feeds-screws and their nuts lol

Stuart Bridger23/07/2019 16:05:35
346 forum posts
17 photos

Continental units have a different screwcutting gearbox as well the leadscrew. Mine is imperial, but does have the dual dials. which i have been told is quite rare. Very useful though.

mark costello 123/07/2019 16:28:55
avatar
541 forum posts
12 photos

From across the pond Mine has dual dials. Wondered what the funny numbers were for!

DC31k23/07/2019 19:37:09
59 forum posts
Posted by Stuart Bridger on 23/07/2019 16:05:35:

Continental units have a different screwcutting gearbox as well the leadscrew. Mine is imperial, but does have the dual dials. which i have been told is quite rare. Very useful though.

And strangely enough, although the Continental model has an impressive range of imperial threading abilities, I believe the dual dials only work on imperial feedscrews. Hence, you could have imperial threads on a Continental but could not have imperial dials.

The only serious thing an imperial machine cannot do is M12 (x 1.75) threads. However, with 36t and 63t change gears from an ancient Drummond, it can.

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