Emco Compact 5 Modifications

[Colin CreedParticipant @colincreed93792]

Here’s that YouTube post I’d made mention of previously about the making of a “cut knurling tool”.

https://youtu.be/vj8pp3YJijg?si=JDKJVENAkE8kAHI1

[Graham MeekParticipant @grahammeek88282]

When using normal form knurling tools it is customary to be working at slow speeds. Some of the knurls above were produced at 300-500 RPM. The higher speed tends to get rid of the chips better. One Beauty of Jacques design is the simplicity in setting up. Admittedly it does take two passes when doing a diamond knurl, but given the results it is well worth the extra pass.

I have been having a go at putting John’s advice into practice when using the Helical knurling wheel to produce a straight knurl, and I must say it makes a difference. I have also rigged up a compressed air stream across the work and this gives a further improvement. When I get a chance I will take some photos of the results.

Regards

Gray,

[Graham MeekParticipant @grahammeek88282]

John has just completed the 3D view of my diminutive Cut Knurling tool.

This shows the construction details very well, especially the fine adjustment, (the small block held by two cap screws), to correct the helical spiral some knurls produce because they are not at the correct angle. Note also the spring loaded plunger to keep the index plate in place when turning the head from one position to another.

Regards

Gray,

[Colin CreedParticipant @colincreed93792]

Hi Graham,

 

Thanks for the update on this & to John for his 3D view.

I’m keen to know more about the pro’s & con’s to making this tool.

 

regards Colin

[Graham MeekParticipant @grahammeek88282]

Hi Colin,

The Cut knurling process is a lot kinder to the machine than the Forming process of more conventional Knurling techniques. The large pattern of the Diamond knurling shown above would be nigh on impossible to do on the C5, using the Forming process. Yet the C5 cut this knurl with no trouble at all using this tool.

Regards

Gray,

[Graham MeekParticipant @grahammeek88282]

Just a few photographs to show the latest additions to the C5.

This next view shows the drive cover removed and the Proxxon Collet chuck adaptor fitted.

The two spanners are required to change the various Arbors. The Hexagon can just be made out behind the timing belt. The tapers ensure complete repeatability as regards concentricity and run-out once a wheel has been dressed.

The next photograph shows the unit fitted to the lathe.

It is not the best picture as the workshop space means I cannot get a better shot.

There is plenty of room between the tailstock body and the grinder body as can be seen above.

The next item is thanks to John Slater who provided the No2 Morse Taper blank. Those of you who have tried using a No 2 Morse Taper Collet in the C5 will know the collet disappears into the Mandrel socket by some considerable margin. This is not handy if the work to be machined is only just protruding beyond the collet. This attachment overcomes this problem.

There are a couple of other items I intend to add later.

Regards

Gray,

[Colin CreedParticipant @colincreed93792]

Hi Graham,

Nicely thought out & it looks to be a terrific addition for your C5 Lathe.

regards Colin

[Graham MeekParticipant @grahammeek88282]

Hi Colin,

Thanks for the kind words. This project seems to have dragged on a bit, just like our winter, but I managed to complete it. I have a job coming up for the Proxxon Mill that will put the grinder through its paces.

Regards

Gray,

As promised there are a few more photos to share,

This is the view from the operators position.

The next item has been waiting to be made for some while. It is taken from an article on U3 & C5 Accessories, by Graham Nickson.

I have made it slightly thicker than the the original drawing as I wanted to use standard cap screws to attach the adaptor, instead of the countersunk screws shown on the drawing. I should point out that this article contains a Drawing Error. The Pitch Circle Diameter (PCD) for the attachment screws is shown at 30 mm. This should be 29 mm PCD. It may well be the information supplied by Graham was correct but it may have been regarded as the wrong dimension by the magazine, alas we shall never know.

This next item was originally intended to fit the U3.

When I first tried to fit this 70 mm Soba chuck to the U3 it fouled the headstock casting. The recess for the mounting face was too deep. A small skim off the offending face soon rectified this. When I stood back I felt the chuck looked hideous. Upon further investigation the scroll inner diameter would allow the 29 mm PCD of the C5 mounting screws to pass through. With the aid of a location plate to register on the 40 mm C5 Mandrel diameter and some M5 Allen grubscrews for radial adjustment I now have a chuck with “Griptru” characteristics. Which is very helpful in its new role on the Dividing attachment.

Regards

Gray,

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