When is D1-4 not D1-4.

[ukracer]

When it's D1-3 I guess.

I purchased a crawford Hydraulic Collet chuck and it was supposed to be D1-4. But after purchasing a second hand 8 inch 3 jaw I decided to tidy my workshop and garage and see how accurate they were.

MMMMMMMMMMM that was when my problems started. First I offered the collet chuck up and it was obvious why it would not fit......I am guessing it's D1-3.

So onto the 3 jaw and better luck this time it fits the holes....but does not tighten up. It would appear, and I wait to be corrected but , D1-4 is not an exact standard.

I have got it to fit but I had to adjust the pins to accept the cam when turning. So.it appears you cant just get a D1-4 backplate and expect it to fit another D1-4 lathe with out adjusting it.

 

[scottmk1]

D1-4 etc is standard. Any D1-4 back plate should fit your spindle nose.

http://images.machineryhouse.com.au/products/L287/Overview/Overview.jpg

Check the pins are installed to the correct depth, and that they are not seized as both of these will cause problems with fitment.

 

[ukracer]

D1-4 etc is standard. Any D1-4 back plate should fit your spindle nose.

http://images.machineryhouse.com.au/products/L287/Overview/Overview.jpg

It didn't. ....I think it has some thing to do with the lines marked on the pegs.

 

[scottmk1]

Yes if the pins are not installed correctly you will have problems

 

[Pete.]

It didn't. ....I think it has some thing to do with the lines marked on the pegs.

The lines are just a reference to give you a starting point. Set all the pins on the lines then adjust as required 1 turn at a time.

 

[ukracer]

The pitch diameter is obviously different when offering a D1-3 up so that one is fair enough I will ask the seller for a D1-4 back plate and machine it to fit collet chuck.

The only thing I can think of is the 3 jaw was cleaned up and the pins screwed in too deep when put back together. That said it did not look messed with.. it did not fit until I screwed out the pins 2 full turns.

 

[ukracer]

Yes if the pins are not installed correctly you will have problems

I assumed the chuck fitted the lathe it came off and not been messed with. I mean to adjust it you need to take out the stop screws. It does not look as if the chuck had been dismantled for cleaning.

 

[graffian]

Does the taper fit?
Do the pins fit?
I don't think any of the taper sizes or pin diams interchange.

 

[ukracer]

Taper and pins fit on the 3 jaw. But did not luck as the pins were 2 turns in too far. They were not allowing the cam to engage the detent.

The collet chuck pins taper and pin centers do not fit..too small. Definately D1-3

 

[Flathead_Dave]

Camlock chucks won't interchange between machines without adjustment.When set up,you should scribe a line on the chuck,so it goes back in the same position on the lathe it was set up on.
This scanned better as pdf than jpeg,so I uploaded here

https://app.box.com/s/y96xna2zp5ob4406up0ut4jpypbamaml

 

[Maker]

Do the pins on the collet chuck screw directly into the chuck or is there a removable backplate with the pins in it?

 

[Flathead_Dave]

If the chuck was made as a camlock,then the pins go straight in.If you bought a plain chuck,you could use a camlock back plate.

 

[ukracer]

We

Do the pins on the collet chuck screw directly into the chuck or is there a removable backplate with the pins in it?

LOL that's a good question for a minute there I thought you were psychic. Lol

I am actually doing what I hate today and tidying up garage and workshop. BUT out of interest I went to check the diameter of the pins in the collet chuck. (It does have a backplate by the way. )

One of the pins came out in my hand....I thought stripped thread but no ,its too small, but not small enough to fall out. They are all the same size NOT stripped. My guess is ones metric the other is not. I am glad it was the wrong size now.....dread to think what would have happen if it had of fitted.

Anyway I have not checked sizes yet as SWMBO called me in.. but something g really strange is going on. Advertised as D1-4 but too small and pins look like they might actually be D1-4 size looking by eye.

However it does not make sense that the threads would be smaller on a bigger size backplate....it's mind boggling . Lol

 

[Pete.]

Yes you can get camlock pins with metric or imperial theads. Clearly you need the right threaded pin for your chuck. If the pins plugged into the holes thenit's the right Dfitting because all the camlocks have different diameter pins.

http://www.machineryhouse.com.au/L287

 

[ukracer]

Yes you can get camlock pins with metric or imperial theads. Clearly you need the right threaded pin for your chuck. If the pins plugged into the holes thenit's the right Dfitting because all the camlocks have different diameter pins.

http://www.machineryhouse.com.au/L287

No that's the point great is too small but the pin does not go into the hole. Leading me to believe they are D1-4 pins....will check in a minute.

 

[Pete.]

If the pin is too big it's the wrong camlock.

 

[I'm getting on a bit]

I wanted to know this "I have a D1-3"

Lathes. Co. UK has all the info it's an American system so imperial

The 3 relates to the spindle nose diameter the 3 is 3.625" diameter the D1-4 is 4.625" diameter and strangley some of the pins are neither imperial or metric

Go to the bottom of this page for the full spec http://www.lathes.co.uk/latheparts/page9.html

 

[Flathead_Dave]

The pins are imperial,the D1-3 is 19/32"

 

[ukracer]

The pins are imperial,the D1-3 is 19/32"

It's not the pins that are in question mate.

I have now confirmed some divy has put D1-4 pins in a D1-3 backplate. So they did not actually go deep enough to go into the hole as the diameter of the pin ltself is too large (just the way it was designed with safeguard in mind I guess)

what has caused confusion with mine is the threads were different.


The one on the right is the ones that came in the D1-3 backplate...

 

[Flathead_Dave]

Knew I had this somewhere,it was hiding in a S&B manual.

https://app.box.com/s/mnj1h80ekc9vuq6ps79femsu9u6fbtxz