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[Edited Message Follows]

Managed to complete the ELS on my Chester d7 lathe with great help from Richard Edwards. I can now screwcut right up to a shoulder with the help of electronic stops, taper tunring, motor crossfeed auto screwcuting .etc?

[Edited Message Follows]

Hi Ralph the motor on z leadscrew is a Nema 23 4.2 amp/3 NM on 10mm shaft. The motor on cross feed x is? a Nema 23? 2.8Amp 1.26 nm a shortened version about 2.1/2 inch long which is ample for my lathe. Couple more pics of the setup?

?

Regards Les

?

?

On Monday, 30 September 2019, 19:34:46 BST, Ralph Hulslander <rhulslander@...> wrote:

?

?

les what is the motor on the leadscrew? and what did you use for X, any pictures?

On Mon, Sep 30, 2019 at 12:24 PM les higgins via Groups.Io <leshiggins=[email protected]> wrote:

[Edited Message Follows]

Managed to complete the ELS on my Chester d7 lathe with great help from Richard Edwards. I can now screwcut right up to a shoulder with the help of electronic stops, taper tunring, motor crossfeed auto screwcuting .etc?

?

?

--
Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer

Managed to complete the ELS on my Chester d7 lathe with great help from Richard Edwards. I can now screwcut right up to a shoulder with the help of electronic stops, taper tunring, motor crossfeed auto screwcuting .etc?

Hi thanks John give my regards to Richard. With regard to the compound slide removal this is my next project and I am going to order a cast Iron or steel block and machine it to size. The cross slide? motor feed will be very helpful for facing in this regard. I have already made a no 2 MT on the machine and I am amazed how accurate it was. Got a little problem with backlash on cross slide but I going to modify by using two pairs of roller thrust bearings and boring out the recess on carriage end and making a new cross feed nut and maybe a new lead screw. Thinking of using silver steel/drill rod for the lead screw. Meanwhile I find the lathe now much more usable the electronic stops are magical and I did an experiment with a dial gauge to z? axis for repeatably and I was amazed it was within 0.01 mm? .The Cross slide x was accurate too but as stated I am going to modify the carriage? ??

Regards Les

On Tuesday, 1 October 2019, 06:40:32 BST, John Lindo <bechetboat@...> wrote:

Les

Well done, all looks good.

Glad you opted for a power cross slide.

You may want to consider in the future removal of the compound slide. I took mine off, now with the ELS any serious?

angular cutting "large chamfers" for example, I find compound not necessary.

I have Richard here with me, I will pass on your accolades and show him the photos.

Thanks

John

Virus-free.

On Mon, 30 Sep 2019 at 17:49, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Managed to complete the ELS on my Chester d7 lathe with great help from Richard Edwards. I can now screwcut right up to a shoulder with the help of electronic stops, taper tunring, motor crossfeed auto screwcuting .etc?

--
John

Thanks John a really good source of info, I just realised my typo on the header with double ll . I have used thread carbide inserts for cutting threads and they seem good for direct plunge cutting. I am contemplating doing a left hand thread for a new cross slide lead screw on stainless steel 1.0mm pitch but I think I need dedicated a EL insert although experimenting with standard ER ones seem to cut ok but I think I will get the EL inserts anyway. Anyway to use an old expression the ELS is the best thing since sliced bread.?

Hi John? my RELS is? finished but I am modifying the x cross slide with ball thrust bearings. I have made a new cross slide lead screw from stainless steel? using a travelling steady and a modified nut which I am waiting for a left hand 10 M 1.0 pitch tap? and the bearings from China. The screw cutting was made easier with the stops which I am really pleased? with

John?

No I don't know anything about the "conning tower cross feed" would be interested in that. I should get my M10? 1p? LH taps shortly. Like a lot of these mini lathes the cross slide back lash adjustment leaves a lot to be desired even though my machine is a Chester db7 similar to Warco 180 is supposed to be an? uprated design. The cross feed nut is cast iron and only about 15 mm long with some slop. I have seen on youtube a mod on the same lathe as mine that uses ball race thrust bearings? plus an ingenious nut made out of Delrin clamped within a steel square housing of about 30mm long? and about 21mm square don't know about the longevity of the Delrin but I suppose you could make a few of them and change if required.? I am going to have a go at that. Meanwhile I would like to see some pics of your modification and thanks for your interest

Regards Les

On Tuesday, 8 October 2019, 17:58:18 BST, John Lindo <bechetboat@...> wrote:

Les.?

Do you know about the conning tower cross feed type nut I developed for the 7 x lathes.

So simple, but very effective for backlash control.

Let me know, I can send photos etc.

I have 2 x 10 x 1.0 mm LH taps, Richard could of brought one back with him.

cheers

John

Virus-free.

On Tue, 8 Oct 2019 at 11:03, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi John? my RELS is? finished but I am modifying the x cross slide with ball thrust bearings. I have made a new cross slide lead screw from stainless steel? using a travelling steady and a modified nut which I am waiting for a left hand 10 M 1.0 pitch tap? and the bearings from China. The screw cutting was made easier with the stops which I am really pleased? with

--
John

Hi looks like a good mod looking forward to your pics. I noticed that my Z axis was throwing a bit and I modified the z axis by putting needle bearings in the bearing blocks . The lathe already had? double ball race? thrust washers as standard on the tailstock end. However, I noticed that the leadscrew? is still out about 0.3 mm on the headstock end and it seams the lead screw is either bent or the end shaft is not concentric with the lead screw so I am going to take the leadscrew off and test for straightness .

Regards Les

On Wednesday, 9 October 2019, 07:18:57 BST, John Lindo <bechetboat@...> wrote:

Les

I will send info reference the" conning tower" feed nut this weekend.

Basically a square nut about 20 mm long can be cast iron or phosphor bronze. this has a spud (spigot) sticking up that fits into a hole from the underside of the top x feed slide.

The fit between spud and hole is about .02 mm dia clearance.

There is a chamfered allen screw that keeps the nut attached the the top cross slide.

Either side of the hols for the spigot are holes drilled and tapped for pointed grubs,?

these locate directly into dibbits in the top of the nut face. We can call these jacking

screws for adjusting the other words the nut is tipped thus setting backlash to

almost zero.

The nut cannot shift as basically retained by the c/s screw and will not shift back and forth as?

the pointed grubs prevent this.

This is not a new principle, most high end lathes adopt a similar principle, just that i adopted

this for the mini lathe.The original OE as supplied backlash nut, well say no more.

but totally useless.

My idea has been adopted by 2 other forum members, possibly let them explain more for clarification.

Again, I try and will send info through the week end, but all info available through the Home Shop machinist

I will try and find the date of publication.

Also available I think, in the 7 x forum files. again I cannot remember when, possibly 3 -4 years ago ???

under an article called "swiss cheese" with a zillion more modifications how dare they LOL.

Not sure if you extended the cross slide travel with a block, by doing this I increased the travel of the cross slide operator side by 24 mm, which gives and additional 48 mm of dia that can be turned.

You can also once the compound slide is removed (gr!!!!!!!!!) fit on the new riser block and drill and

tap holes in any position for the tool post stud, this will increase the diameters to be cut vastly

without losing ridigity.?

Currently I have not fitted thrust bearings, i am OK at this moment, but a back burner job.

I have the needle inner and the outer washers,

With b/l under control, the end of the feed screw is held by the oldham coupling (flexible drive) connected

to the stepper motor, and the front of the screw with the shoulder against my new extension block,

there is no movement, but a thrust washer set up is icing on the cake.?

I need to revisit this, I guess i am lazy LOL.

GOWIL?

I also cut a new cross slide screw using 10 mm dia silver steel (drill rod) and the manual threading function

of the ELS, it?s MAGIC.

All food for thought, you have certainly picked up the gauntlet and GOWIL. Very well done.

I just love to read of positive actions by the forum members.?

GOWIL means Get on with it Lewis, form the famous books of the police Inspector Morse.

He had a sergeant who did all the footwork, solving the crimes and Morse would sit in a pub/bar drinking

saying GOWIL can?t you see I am busy.

Have a good productive day

Cheers

On Wed, 9 Oct 2019 at 00:42, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

John?

No I don't know anything about the "conning tower cross feed" would be interested in that. I should get my M10? 1p? LH taps shortly. Like a lot of these mini lathes the cross slide back lash adjustment leaves a lot to be desired even though my machine is a Chester db7 similar to Warco 180 is supposed to be an? uprated design. The cross feed nut is cast iron and only about 15 mm long with some slop. I have seen on youtube a mod on the same lathe as mine that uses ball race thrust bearings? plus an ingenious nut made out of Delrin clamped within a steel square housing of about 30mm long? and about 21mm square don't know about the longevity of the Delrin but I suppose you could make a few of them and change if required.? I am going to have a go at that. Meanwhile I would like to see some pics of your modification and thanks for your interest

Regards Les

On Tuesday, 8 October 2019, 17:58:18 BST, John Lindo <bechetboat@...> wrote:

Les.?

Do you know about the conning tower cross feed type nut I developed for the 7 x lathes.

So simple, but very effective for backlash control.

Let me know, I can send photos etc.

I have 2 x 10 x 1.0 mm LH taps, Richard could of brought one back with him.

cheers

John

Virus-free.

On Tue, 8 Oct 2019 at 11:03, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi John? my RELS is? finished but I am modifying the x cross slide with ball thrust bearings. I have made a new cross slide lead screw from stainless steel? using a travelling steady and a modified nut which I am waiting for a left hand 10 M 1.0 pitch tap? and the bearings from China. The screw cutting was made easier with the stops which I am really pleased? with

--
John

--
John

Yes both sides of the RH plummer block.I removed about 4 mm per side if i recall.

IE 2 x the overall thrust bearing thicknesses.

This then also takes up the b/lash as there is nothing the LH end of the screw.Just the plain abr of the screw in a long bore.

I still used the R Bull back lash nut on the RH side, and clamped the coupling around that.

I needed to bore out the coupling?from 12 mm dia to 14 mm dia?? for it to fit. 10 mm to the stepper spindle

the other end of the coupling.

Consider if the screw is straight elongating the 2 support blocks so you have some up and down movement.

but also check the engagement?of the feed screw half nuts.

I am sure you have all this under your bet.

John

On Wed, 9 Oct 2019 at 10:55, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi looks like a good mod looking forward to your pics. I noticed that my Z axis was throwing a bit and I modified the z axis by putting needle bearings in the bearing blocks . The lathe already had? double ball race? thrust washers as standard on the tailstock end. However, I noticed that the leadscrew? is still out about 0.3 mm on the headstock end and it seams the lead screw is either bent or the end shaft is not concentric with the lead screw so I am going to take the leadscrew off and test for straightness .

Regards Les

On Wednesday, 9 October 2019, 07:18:57 BST, John Lindo <bechetboat@...> wrote:

Les

I will send info reference the" conning tower" feed nut this weekend.

Basically a square nut about 20 mm long can be cast iron or phosphor bronze. this has a spud (spigot) sticking up that fits into a hole from the underside of the top x feed slide.

The fit between spud and hole is about .02 mm dia clearance.

There is a chamfered allen screw that keeps the nut attached the the top cross slide.

Either side of the hols for the spigot are holes drilled and tapped for pointed grubs,?

these locate directly into dibbits in the top of the nut face. We can call these jacking

screws for adjusting the other words the nut is tipped thus setting backlash to

almost zero.

The nut cannot shift as basically retained by the c/s screw and will not shift back and forth as?

the pointed grubs prevent this.

This is not a new principle, most high end lathes adopt a similar principle, just that i adopted

this for the mini lathe.The original OE as supplied backlash nut, well say no more.

but totally useless.

My idea has been adopted by 2 other forum members, possibly let them explain more for clarification.

Again, I try and will send info through the week end, but all info available through the Home Shop machinist

I will try and find the date of publication.

Also available I think, in the 7 x forum files. again I cannot remember when, possibly 3 -4 years ago ???

under an article called "swiss cheese" with a zillion more modifications how dare they LOL.

Not sure if you extended the cross slide travel with a block, by doing this I increased the travel of the cross slide operator side by 24 mm, which gives and additional 48 mm of dia that can be turned.

You can also once the compound slide is removed (gr!!!!!!!!!) fit on the new riser block and drill and

tap holes in any position for the tool post stud, this will increase the diameters to be cut vastly

without losing ridigity.?

Currently I have not fitted thrust bearings, i am OK at this moment, but a back burner job.

I have the needle inner and the outer washers,

With b/l under control, the end of the feed screw is held by the oldham coupling (flexible drive) connected

to the stepper motor, and the front of the screw with the shoulder against my new extension block,

there is no movement, but a thrust washer set up is icing on the cake.?

I need to revisit this, I guess i am lazy LOL.

GOWIL?

I also cut a new cross slide screw using 10 mm dia silver steel (drill rod) and the manual threading function

of the ELS, it?s MAGIC.

All food for thought, you have certainly picked up the gauntlet and GOWIL. Very well done.

I just love to read of positive actions by the forum members.?

GOWIL means Get on with it Lewis, form the famous books of the police Inspector Morse.

He had a sergeant who did all the footwork, solving the crimes and Morse would sit in a pub/bar drinking

saying GOWIL can?t you see I am busy.

Have a good productive day

Cheers

On Wed, 9 Oct 2019 at 00:42, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

John?

No I don't know anything about the "conning tower cross feed" would be interested in that. I should get my M10? 1p? LH taps shortly. Like a lot of these mini lathes the cross slide back lash adjustment leaves a lot to be desired even though my machine is a Chester db7 similar to Warco 180 is supposed to be an? uprated design. The cross feed nut is cast iron and only about 15 mm long with some slop. I have seen on youtube a mod on the same lathe as mine that uses ball race thrust bearings? plus an ingenious nut made out of Delrin clamped within a steel square housing of about 30mm long? and about 21mm square don't know about the longevity of the Delrin but I suppose you could make a few of them and change if required.? I am going to have a go at that. Meanwhile I would like to see some pics of your modification and thanks for your interest

Regards Les

On Tuesday, 8 October 2019, 17:58:18 BST, John Lindo <bechetboat@...> wrote:

Les.?

Do you know about the conning tower cross feed type nut I developed for the 7 x lathes.

So simple, but very effective for backlash control.

Let me know, I can send photos etc.

I have 2 x 10 x 1.0 mm LH taps, Richard could of brought one back with him.

cheers

John

Virus-free.

On Tue, 8 Oct 2019 at 11:03, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi John? my RELS is? finished but I am modifying the x cross slide with ball thrust bearings. I have made a new cross slide lead screw from stainless steel? using a travelling steady and a modified nut which I am waiting for a left hand 10 M 1.0 pitch tap? and the bearings from China. The screw cutting was made easier with the stops which I am really pleased? with

--
John

--
John

--
John

If you consider an extension block on the front of the compound.

Suggest you cut in the dovetails that match the x slide.more rigid.and supports the gib when x slide is fully extended out.

Needs s bit of fine milling to get it correct?

I will try and dig out some photos.

John

On Wed, 9 Oct 2019, 11:11 John Lindo via Groups.Io <bechetboat=[email protected] wrote:

Yes both sides of the RH plummer block.I removed about 4 mm per side if i recall.

IE 2 x the overall thrust bearing thicknesses.

This then also takes up the b/lash as there is nothing the LH end of the screw.Just the plain abr of the screw in a long bore.

I still used the R Bull back lash nut on the RH side, and clamped the coupling around that.

I needed to bore out the coupling?from 12 mm dia to 14 mm dia?? for it to fit. 10 mm to the stepper spindle

the other end of the coupling.

Consider if the screw is straight elongating the 2 support blocks so you have some up and down movement.

but also check the engagement?of the feed screw half nuts.

I am sure you have all this under your bet.

John

On Wed, 9 Oct 2019 at 10:55, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi looks like a good mod looking forward to your pics. I noticed that my Z axis was throwing a bit and I modified the z axis by putting needle bearings in the bearing blocks . The lathe already had? double ball race? thrust washers as standard on the tailstock end. However, I noticed that the leadscrew? is still out about 0.3 mm on the headstock end and it seams the lead screw is either bent or the end shaft is not concentric with the lead screw so I am going to take the leadscrew off and test for straightness .

Regards Les

On Wednesday, 9 October 2019, 07:18:57 BST, John Lindo <bechetboat@...> wrote:

Les

I will send info reference the" conning tower" feed nut this weekend.

Basically a square nut about 20 mm long can be cast iron or phosphor bronze. this has a spud (spigot) sticking up that fits into a hole from the underside of the top x feed slide.

The fit between spud and hole is about .02 mm dia clearance.

There is a chamfered allen screw that keeps the nut attached the the top cross slide.

Either side of the hols for the spigot are holes drilled and tapped for pointed grubs,?

these locate directly into dibbits in the top of the nut face. We can call these jacking

screws for adjusting the other words the nut is tipped thus setting backlash to

almost zero.

The nut cannot shift as basically retained by the c/s screw and will not shift back and forth as?

the pointed grubs prevent this.

This is not a new principle, most high end lathes adopt a similar principle, just that i adopted

this for the mini lathe.The original OE as supplied backlash nut, well say no more.

but totally useless.

My idea has been adopted by 2 other forum members, possibly let them explain more for clarification.

Again, I try and will send info through the week end, but all info available through the Home Shop machinist

I will try and find the date of publication.

Also available I think, in the 7 x forum files. again I cannot remember when, possibly 3 -4 years ago ???

under an article called "swiss cheese" with a zillion more modifications how dare they LOL.

Not sure if you extended the cross slide travel with a block, by doing this I increased the travel of the cross slide operator side by 24 mm, which gives and additional 48 mm of dia that can be turned.

You can also once the compound slide is removed (gr!!!!!!!!!) fit on the new riser block and drill and

tap holes in any position for the tool post stud, this will increase the diameters to be cut vastly

without losing ridigity.?

Currently I have not fitted thrust bearings, i am OK at this moment, but a back burner job.

I have the needle inner and the outer washers,

With b/l under control, the end of the feed screw is held by the oldham coupling (flexible drive) connected

to the stepper motor, and the front of the screw with the shoulder against my new extension block,

there is no movement, but a thrust washer set up is icing on the cake.?

I need to revisit this, I guess i am lazy LOL.

GOWIL?

I also cut a new cross slide screw using 10 mm dia silver steel (drill rod) and the manual threading function

of the ELS, it?s MAGIC.

All food for thought, you have certainly picked up the gauntlet and GOWIL. Very well done.

I just love to read of positive actions by the forum members.?

GOWIL means Get on with it Lewis, form the famous books of the police Inspector Morse.

He had a sergeant who did all the footwork, solving the crimes and Morse would sit in a pub/bar drinking

saying GOWIL can?t you see I am busy.

Have a good productive day

Cheers

On Wed, 9 Oct 2019 at 00:42, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

John?

No I don't know anything about the "conning tower cross feed" would be interested in that. I should get my M10? 1p? LH taps shortly. Like a lot of these mini lathes the cross slide back lash adjustment leaves a lot to be desired even though my machine is a Chester db7 similar to Warco 180 is supposed to be an? uprated design. The cross feed nut is cast iron and only about 15 mm long with some slop. I have seen on youtube a mod on the same lathe as mine that uses ball race thrust bearings? plus an ingenious nut made out of Delrin clamped within a steel square housing of about 30mm long? and about 21mm square don't know about the longevity of the Delrin but I suppose you could make a few of them and change if required.? I am going to have a go at that. Meanwhile I would like to see some pics of your modification and thanks for your interest

Regards Les

On Tuesday, 8 October 2019, 17:58:18 BST, John Lindo <bechetboat@...> wrote:

Les.?

Do you know about the conning tower cross feed type nut I developed for the 7 x lathes.

So simple, but very effective for backlash control.

Let me know, I can send photos etc.

I have 2 x 10 x 1.0 mm LH taps, Richard could of brought one back with him.

cheers

John

Virus-free.

On Tue, 8 Oct 2019 at 11:03, les higgins via Groups.Io <leshiggins=[email protected]> wrote:

Hi John? my RELS is? finished but I am modifying the x cross slide with ball thrust bearings. I have made a new cross slide lead screw from stainless steel? using a travelling steady and a modified nut which I am waiting for a left hand 10 M 1.0 pitch tap? and the bearings from China. The screw cutting was made easier with the stops which I am really pleased? with

--
John

--
John

--
John

--
John