Trade Adverts

Call Steve Cox on 07836 736496 or email for quote. Machinery removal and transportation service based in West Yorkshire, UK coverage. Crane can lift 1100kg at 1.2 metres and 420kg at 4.0 metres. Vehicle can carry 1100kg on 10 foot x 7 foot flatbed.
Now using flatbed Transit with rear mounted…
Read more...
I offer a casting service specialising in small batches and one offs, producing good quality castings in variours alloys using the lost wax process, ideal for the model engineer and restorer. Any enquiries and more details can be found on my web site. www.abbeycasting.c......
Read more...
Always wanted, Myford ML7 & Super 7 or ML10 Lathes. The good, the bad or the ugly. Read more for contact details. ...
Read more...
Hi we are the people that host this wonderful site and want to offer our services to members of clubs and groups that would like their own presence on the world wide web. We have special unlimited space and transfer for only £40 £33 a year for clubs…
Read more...
...
STEAMPLATES produce high quality polished and enamelled name plates  etc. in Brass and Aluminium from 1" x 1/2" up to 96" x 48".  Reproduction steam related name and other plates can be made to FULL  SCALE.

We also make other…
Read more...
Want to put your advert on the site like this one. We get over 25,000 visitors a month to these pages and your name could be right here at the top of the listings. If you haven't got a web site that's no problem, we can just put the details…
Read more...
Home Workshop > Members > Forum > Projects Area > General > Trugrip Collet chuck Mods

New forum, please make sure you select which category you need to post in. Any posts just dropped in the general category will be moved or deleted, depending on what mood the moderators are in.
Guests can reply to posts in the information forum, so you don't need to log in to answer someone.


Now 3 members online
and 84 guests online
Powered by JoomlaMe

Trugrip Collet chuck Mods

Trugrip Collet chuck Mods

It has always been frustrating for me that the collets for the Crawford “TRUGRIP” chuck I have always found so diffcult to obtain. But then I made a very useful little discovery – and I am sure I am not the first – these collets are, except for the thread, virtually identical to the much more common 5C. The body diameter is the same as far as I can measure and the head/shoulders etc are the same. There is a slight difference in length – something like 1/8 inch – and the threads are different handed, but I can live with that. So I set about modifying my Trugrip chuck. All that is needed is a new collar to engage the threads on the 5C chuck – which is 20tpi. So, having sourced a mild steel disc, machining one is fairly straightforward. The original was hardened and ground – mine will be left untreated because I do not have precision grinding equipment and the amount of use it will get in my hands will probably see it ok for the next century!

The original is easy to remove, and it is then just a matter of obtaining the major dimensions from it, along with thread dimensions for the 5C collet and off you go! Once machined so that the collet screwed in snugly and the spigot fit the ring gear snugly, the ring gear was then used as a jig to drill holes for the driving pins and the retaining screws.
http://www.homeworkshop.org.uk/components/com_agora/img/members/85/trugrip-chuck-mod.jpghttp://www.homeworkshop.org.uk/components/com_agora/img/members/85/trugrip-chuck-mod2.jpghttp://www.homeworkshop.org.uk/components/com_agora/img/members/85/trugrip-chuck-mod3.jpg

all I need to do now is decide which lathe to use it on (needs a backplate)
I don’t claim this as something new – it is so simple that I cannot believe no-one has done it before – and others may wish to copy it and elevate a curiosity into a very useable and useful tool - especially given the range of 5C collets available.

Edited By: PeterS
Jan-09-12 15:27:32

"He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors"
Thomas Jefferson

useravatar
Peter Smithurst
PeterS
Craftsman
ranks
Offline
261 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Ah yes, the wonderful thing about standard collets is that every manufacturer has their own damned standard!

Nice work Peter.

- Richard -

useravatar
Richard Shute
SharkfacePilot
Who dies with most toys, wins
Designer
ranks
Offline
504 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

The wonderful world of Collet, never did discover what the ones in my old mill were, sorted thouugh many a bin of mixed collets to choose the ones that looked right but when I got home they weren't. Been after a good collet chuck for may lathe for ages this opens up more possibilities. Yet to find one I can afford.
A

Ashley (Remap Volunteer look us up  www.remap.org)

useravatar
Ashley Slater
oznob
Ashley
Foreman
ranks
Offline
697 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Colchester themselves produced this Mod' I have a drawing somewhere............................................Vic..

useravatar
Victor Scott
vickentallen
Charge Hand
ranks
Offline
52 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

good for Colchester - the Griptru must have caused problems even at the outset! What I do not know is what varieties of Griptru were produced and whether they all used the same collet - in other words, whether they are all as easily adaptable to 5C!

"He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors"
Thomas Jefferson

useravatar
Peter Smithurst
PeterS
Craftsman
ranks
Offline
261 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Colchester Trugrip Chucks came in two sizes 5" and 7" ............................ COLLET #s as follows 9252 & 9267 respectivly

useravatar
Victor Scott
vickentallen
Charge Hand
ranks
Offline
52 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

I made the same mod. to my Griptru chuck when I found how rare the collets were, the result is a good quality chuck which you can get collets for easily, the only small downside is because the threads on the 5C collets are much finer, the chuck key has to be turned much more to tighten the collets.

useravatar
Richard Rojek
Richard
Workman
ranks
Offline
20 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Inspired by the ingenuity here I wonder if I could stick a 5c into the right sized Burnerd collet , (I recently acquired a set cheaply , with the D3 chuck ready for the day in the distant future my CVA is gleaming and running )
Why would I want to do this when the Burnerds will already grip any size of round and hex ?

Well one could then collet square bar,washers (in a 5C step chuck)and use 5C internal collets.

The manufacturers and industry might be happy with millions of different "standard" collets but we amateurs will always find ways of slipping a surreptitious  hand over our wallets. I can't try it until the lathe is running and no doubt when I do I'll be sweating that nothing slips, possibly ruining a 5C ,and more seriously a Burnerd collet.
Don't suppose anyone's tried it have they ?

Alan. Everyday is a schoolday.

useravatar
Alan Frost
alanfrost43
Supervisor
ranks
Offline
131 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Peter Smithurst wrote:

good for Colchester - the Griptru must have caused problems even at the outset! What I do not know is what varieties of Griptru were produced and whether they all used the same collet - in other words, whether they are all as easily adaptable to 5C!

The Griptru is a 3 jaw chuck with a movable scroll to get accuracy.
The Trugrip is the collet chuck which, in 5" size, can be adapted to 5C. Very different animals.

The only advantage that the original Trugrip system had over a 5C is a coarser thread (quicker to use) and a LH thread giving an intuitive "right hand tightening" when turning the chuck key.

Charles

Guest
Offline
Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Is this the famous Charles P we have aboard ?????For some reason the ing wont print

useravatar
Victor Scott
vickentallen
Charge Hand
ranks
Offline
52 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

yes - slip of the keyboard - I should of course have written Trugrip

"He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors"
Thomas Jefferson

useravatar
Peter Smithurst
PeterS
Craftsman
ranks
Offline
261 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Victor Scott wrote:



Is this the famous Charles P we have aboard ?????For some reason the ing wont print

Not sure about fame but I think that you're correct

Charles

Guest
Offline
Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Well,Charles,you ought to be famous as I think we all owe you a debt of gratitude for having some key part along with the gaffer and son in setting up this most wonderful of websites (if I've got my facts right )
PS for Vic. Am not making the most of my life in that I never got as far N. as Oban in the Autumn but have n't forgotten your offer of a cuppa if I make it this year (when spring/summer arrive.) . Not getting to Glasgow so much these days so in general am leaving Bill's stocks undisturbed.Rgds.

Alan. Everyday is a schoolday.

useravatar
Alan Frost
alanfrost43
Supervisor
ranks
Offline
131 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Alan,

If you want to grip square section in a Burnerd KC15 multisize type chuck you should be aware that Crawford made some of their multibore type collets that fit the old version and these were available in hex and square. If your chuck will take EC Burnerd collets then it will take the Crawford, if it only takes the MC style then it probably won't! If you're buying Crawford multibore collets there are two sorts: one that uses springs to separate the jaws and one that uses rubber - the springs fall out and get lost, the rubber perishes, take your pick! I have only seen this in a catalogue, and know of someone who has done it, but not actually tried myself, thus I'm not 100% sure of the Crawford series you need (there were lots) but I think it is 'D' with square and hex collets being numbered in the 70's or 80's, so something like D72 might suit, or not!

Nick

When you stop learning you start dying

useravatar
Nick Kempley
nick61
Foreman
ranks
Offline
533 Posts
Male  Website 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Thanks Nick, I'm pretty ignorant on collets except for the ones I've got and can play with (ER25,30,mt2,5c and the Burnerd ones. ) There's just too many, as Richard says and I only tend to look up the data on those I've got. I don't always understand even that data without a look at my examples. I suspect I won't fully understand your reply until I have a definite need to "collet" more unusual things.
As is often the case with me I was more chasing "capability " than having a need at the moment but you have to pursue these things, if you're to come up with the best answer when the definite need does arise.

Alan. Everyday is a schoolday.

useravatar
Alan Frost
alanfrost43
Supervisor
ranks
Offline
131 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Very late to this particular conversation....

I'm about to make the same modification - are there any "left hand thread" type gotcha's to look out for before I apply greater force to the screws holding the threaded collar in ?

Thanks,

Youra.

useravatar
Youra Turceninoff
Youra
Apprentice
ranks
Offline
5 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

its so long since I did this mod that I've forgotten but I don't recall any nasties!

"He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors"
Thomas Jefferson

useravatar
Peter Smithurst
PeterS
Craftsman
ranks
Offline
261 Posts
Male 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

There are no 'nasties' the screws are just tight and fixed with age. Keep trying.

Nick

When you stop learning you start dying

useravatar
Nick Kempley
nick61
Foreman
ranks
Offline
533 Posts
Male  Website 
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

Thanks Nick, Peter.

A little more persuasion loosened them.
Insides of the chuck need a *really* good clean too - does anyone know what the recommended lubricant is ?

Y.

useravatar
Youra Turceninoff
Youra
Apprentice
ranks
Offline
5 Posts
Administrator has disabled public posting

Re: Trugrip Collet chuck Mods

No, but I'd use a light grease: no good using oil it will get thrown out and there's no nipple to replace it, but the speed of the scroll turning means thick/high temperature grease won't lubricate properly. Lithium based will probably be good.

It's probably mentioned somewhere earlier in this thread but do remember that when you've finished the conversion the chuck needs to turn the opposite way: anti-clockwise to tighten.

Nick

When you stop learning you start dying

useravatar
Nick Kempley
nick61
Foreman
ranks
Offline
533 Posts
Male  Website 
Administrator has disabled public posting

Board Info

Board Stats:
 
Total Topics:
4345
Total Polls:
2
Total Posts:
10613
Total Posts Today:
3
User Info:
 
Total Users:
1382
Newest User:
Simon Osborne
Members Online:
3
Guests Online:
534


Forum Legend:

 Topic
 New
 Locked
 Sticky
 Active
 New/Active
 New/Locked
 New Sticky
 Locked/Active
 Active/Sticky
 Sticky/Locked
 Sticky/Active/Locked

Gallery

[Thiel 158 ...]

Thiel 158 Mill

[Thiel milling m...]

[Steamplate...]

Steamplates

[]

[Stanko 676...]

Stanko 676 left hand side

[Stanko Import t...]

[speedweek ...]

speedweek 2012

[]

[Toolholder...]

Toolholder Mk 22

[]

[Toolholder...]

Toolholdermk23

[]

[Habit some...]

Habit something 1

[Left hand side ...]

[Mill Engin...]

Mill Engine

[]

[Record CL1...]

Record CL1 36x15

[My Record Power...]

[My machine...]

My machines

[]

[Whippet]

Whippet

[]

[Workshop l...]

Workshop lighting

[]

[Recycled M...]

Recycled Mot

[Alternative to ...]

[Habit some...]

Habit something 3

[Top scale showi...]

[Steamplate...]

Steamplates

[]

[Grinding J...]

Grinding Jig 4

[]

[master thr...]

master threads and sundries

[]

[Mill Engin...]

Mill Engine

[]

[Record CL1...]

Record CL1 Instruction Manual

[]

[Studer OB]

Studer OB

[Alignment compl...]

[Over the y...]

Over the years

[A few of my pro...]

[S&B 1024]

S&B 1024

[Smart & Brown 1...]

[Building S...]

Building Sand

[Brick walling o...]

[Grinding j...]

Grinding jig1

[]

[Workshop]

Workshop

[]

 

Disclaimer

Any adverts on the homeworkshop.org.uk site are posted by individuals acting in their own right and do not necessarily reflect the views of the administrators.

By using the site, individual posters agree not to post any defamatory or libellous posts and to accept full responsibility for the items they post.

We do not warrant that the servers that make this website available will be error, virus or bug free and you accept that it is your responsibility to make adequate provision for protection against such threats.

In no event will homeworkshop.org.uk be liable for any incidental, indirect, consequential or special damages of any kind, or any damages whatsoever, including, without limitation, those resulting from loss of profit, loss of contracts, goodwill, data, information, income, anticipated savings or business relationships, whether or not advised of the possibility of such damage, arising out of or in connection with the use of this website or any linked websites.

We do not sell, hire, share or give out your email address.

The software that runs this site (Joomla!) may transfer a temporary cookie so it can keep track of what it’s doing. As it’s temporary it maybe deleted when you leave here.

So that we can measure the popularity of posts, where people come from and other general statistics, we use Google Analytic’s. It may store cookies to track new  and repeat visitors. It does not have any detail on who you are.

Advertising links can use cookies to track from which site you came from. Some of those will be for affiliate links where cookies are used in tracking and payment systems.

All copyrights, trademarks and intellectual property rights remain with the owners unless owned or licensed by the homeworkshop.org.uk site.

This disclaimer notice shall be interpreted and governed by English law, and any disputes in relation to it are subject to the jurisdiction of the courts in England and Wales. 

 

Donate

Want to help us fund the site and time spent by the people behind it then use the button below.

We are not a registered charity so you can't claim it back but it helps pay for the costs of improving the features.

You can also help by looking at the advert on the side menus as we get paid for these BUT please only look at adverts you are interested in, you never know you might find something you never knew existed.