fitting wedge type qctp to Warco WM240

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fitting wedge type qctp to Warco WM240

This topic has 17 replies, 8 voices, and was last updated 11 March 2021 at 19:51 by John Templeman.

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21 July 2020 at 10:55 #27527
Jager
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@jager
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21 July 2020 at 10:55 #486864
Jager
Participant
@jager
I want to fit a wedge type qctp to my Warco WM240.

The problem I have is that the existing toolpost stud is pressed into the slide top via a boss. This boss prevents a qctp from sitting down on the compound top and if I machine the boss off I fear that the remaining metal will be to weak.

An alternative would be to machine a recess in the qctp some 22mm dia x 22 deep.

As I have hesitated to buy a new toolpost and find t is no good I wonder if anyone here has done as I propose. Obvious questions are; is there enough meat in these wedge type toolposts and are they too hard to machine?
21 July 2020 at 11:10 #486872
William Chitham
Participant
@williamchitham75949
Could you make a big washer/spacer to fit round the boss for the toolpost to sit on?
21 July 2020 at 11:28 #486878
Jager
Participant
@jager
I did look at the possibility of using a packing piece but this would raise the new toolpost so much it would prevent me getting the too on centre.
21 July 2020 at 11:41 #486884
Tony Pratt 1
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@tonypratt1
Just machine the boss off the stud until it is below the top slide surface, why do you think doing this will weaken it? I have a WM 290V & when I fitted a wedge type tool post I actually made a new stud.

Tony
21 July 2020 at 11:50 #486886
Journeyman
Participant
@journeyman
You cannot machine out the bore of a wedge type tool-post, there is not enough meat on the central tube that holds it all together. The boss can be machined off or reduced in diameter to fit the tool-post. See Journeyman's Workshop for details of fitting wedge type tool-post to my WM250, it is over a couple of pages as it includes making a a toolpost mount for the cross-slide as well.

John
21 July 2020 at 12:03 #486891
Jager
Participant
@jager
Posted by Tony Pratt 1 on 21/07/2020 11:41:46:

Just machine the boss off the stud until it is below the top slide surface, why do you think doing this will weaken it? I have a WM 290V & when I fitted a wedge type tool post I actually made a new stud.

Tony

I feel the boss is part of the compound casting essential for the strength/integrity of the whole and machining it off would leave a very thin section for fitting the stud to.
21 July 2020 at 12:14 #486892
mechman48
Participant
@mechman48
I fitted a Bison QCTP ( Dickson clone ) to my WM 250V-F, I had to machine the boss off as I had similar problem, plus the original post was smaller than the block so I had to make a new post to fit so far it has worked just fine, getting on for about 7 years now. i still have the original 4 way tool post so if I ever need to use it again all I need to do is make a spacer to fit the 4 way post, not difficult to do.

George.
21 July 2020 at 12:28 #486894
BC Prof
Participant
@bcprof
On both the 280 and gh600 I found that the stud and boss was held in place by a roll pin accessed from.

the underside and hence not part of the casting .

Brian
21 July 2020 at 13:51 #486914
Tony Pratt 1
Participant
@tonypratt1
Is the boss not part of the stud?

Tony
21 July 2020 at 15:01 #486931
mechman48
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@mechman48
Posted by Tony Pratt 1 on 21/07/2020 13:51:10:

Is the boss not part of the stud?

Tony

No the boss is part of the casting. When I did my WM250 I had to remove the anti rotation roll pin from the stud / post via underside of the top slide ( you have to remove the top/compound slide on the WM 250 ) then the stud / post will tap out, then you can machine off the casting boss, then make up a new stud / post to suit your new QCTP. Does your WM240 manual not have a page that shows exploded view of the top slide?

George.
21 July 2020 at 15:55 #486939
Tony Pratt 1
Participant
@tonypratt1
Ah the 240 must be different, my WM 290V Warco topslide is flat & the stud had a stepped diameter.

Tony
23 July 2020 at 12:09 #487222
Jager
Participant
@jager
Thank you gents for your observations which point me in the direction of machining off the boss and making a new stud. Due to my natural caution and inexperience in these matters I am still hesitant despite your various experiences. As your mods have been to larger machines I wonder if they have thicker castings.

I am now trying to find out if a piston type toolpost is capable of being machined out to allow me to retain the boss.

Again, many thanks for your input.
23 July 2020 at 14:43 #487236
Donald Williamson
Participant
@donaldwilliamson36047
Hi I to have a warco lathe which I have had for a few years prior to it I had a clark lathe and mill and i purchased a qctp for it, I to discovered your problem using it on the warco what I did was to bore the qctp to accommodate the boss on the top slide I also had to alter the 4 recesses to under the qctp to suit the locating pin, I hope this helps. My qctp was from arceurotrade.
23 July 2020 at 14:50 #487237
Jager
Participant
@jager
Posted by Donald Williamson on 23/07/2020 14:43:53:

Hi I to have a warco lathe which I have had for a few years prior to it I had a clark lathe and mill and i purchased a qctp for it, I to discovered your problem using it on the warco what I did was to bore the qctp to accommodate the boss on the top slide I also had to alter the 4 recesses to under the qctp to suit the locating pin, I hope this helps. My qctp was from arceurotrade.

Thanks for the response.

Is yours the piston, or wedge type? I have been advised there is insufficient meat in the wedge type to bore out for the boss. Was the qctp hardened and difficult to machine?
23 July 2020 at 15:01 #487239
mechman48
Participant
@mechman48
As I understand it; & from other posters, it can be bored out but preferably with a carbide insert / tip tool as these QCTP generally have very hard / case hardened skin. Try a file across a corner / edge if it skips it's hardened.

George.
25 July 2020 at 18:19 #487609
Jager
Participant
@jager
Job done!

Bowed to superior knowledge and machined the boss off and made a new stud. Incidentally the old stud needed an inordinate amount of pressure to remove so I applied some heat and then pressed it out, I suspect there was some epoxy in there.

Thank you one and all.
11 March 2021 at 19:51 #533290
John Templeman
Participant
@johntempleman87735
Jager, I too have a Warco WM240 could you tell me which QCTP you fitted to your lathe as I am not sure which to buy for mine Regards John
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