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fitting wedge type qctp to Warco WM240

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Jager21/07/2020 10:55:41
38 forum posts
5 photos

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?

William Chitham21/07/2020 11:10:48
139 forum posts
57 photos

Could you make a big washer/spacer to fit round the boss for the toolpost to sit on?

Jager21/07/2020 11:28:03
38 forum posts
5 photos

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.

Tony Pratt 121/07/2020 11:41:46
1971 forum posts
12 photos

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

Journeyman21/07/2020 11:50:49
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1159 forum posts
235 photos

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

Jager21/07/2020 12:03:16
38 forum posts
5 photos
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.

mechman4821/07/2020 12:14:28
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2947 forum posts
468 photos

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.

BC Prof21/07/2020 12:28:32
166 forum posts

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

Tony Pratt 121/07/2020 13:51:10
1971 forum posts
12 photos

Is the boss not part of the stud?

Tony

mechman4821/07/2020 15:01:21
avatar
2947 forum posts
468 photos
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.

Tony Pratt 121/07/2020 15:55:26
1971 forum posts
12 photos

Ah the 240 must be different, my WM 290V Warco topslide is flat & the stud had a stepped diameter.

Tony

Jager23/07/2020 12:09:55
38 forum posts
5 photos

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.

Donald Williamson23/07/2020 14:43:53
18 forum posts

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.

Jager23/07/2020 14:50:34
38 forum posts
5 photos
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?

mechman4823/07/2020 15:01:47
avatar
2947 forum posts
468 photos

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.

Jager25/07/2020 18:19:37
38 forum posts
5 photos

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.

John Templeman11/03/2021 19:51:06
20 forum posts
15 photos

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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