Early Deckel horizontal mill FP0

[John Mellor 1Participant @johnmellor1]

[John Mellor 1Participant @johnmellor1]

I have obtained the Deckel fp mill that is featured in the photo essay on 'lathes.co.uk'. I am looking for the best way to get solid drive to the mandrel.

[Brian WoodParticipant @brianwood45127]

Hello John,

Have you looked at the entry for Deckel on http://www.lathes.co.uk?

Regards Brian

[Gerard O’TooleParticipant @gerardotoole60348]

I have an FP1 but i don't fully understand your question. As standard. drive to the mandrel is via geardrive from the hosizontal drive but i assume this is not working correctly. Or do I misunderstand the problem?

Sorry, just see your question is about the FP0

Edited By Gerard O’Toole on 23/02/2022 17:09:48

[Clive FosterParticipant @clivefoster55965]

Assuming you mean the mandrel that carries horizontal milling cutters normal practice is to have a taper on the end matching that in the spindle with a threaded drawbar running through a hollow spindle to hold it tightly in place. Its quite likely that the drawbar would have also been used to close the collets that were used to hold cutters directly in the spindle nose.

The outside end of the mandrel is usually arranged as a simple plain bearing to support the mandrel with sufficient endwise clearance for all end thrusts to be dealt with by the spindle.

Hopefully you have at least one collet so the type can be identified and the spindle taper derived from it.

However looking at the early brochure pictures on the lathes.www.co site its not clear whether on not the spindle is actually bored through. Some picture might have a drawbar sticking out of the end but its a matter of interpretation. iIf the spindle is solid the collets would have been closed by a nut running down on the external thread on the end of the spindle. Rather after the manner of a modern ER collet. Som eo the lathes.www.co pictures appear to show such a closer nut. If the spindle is solid the mandrel will still have a taper matching the spindle nose but a captive nut fitting the exteranl thread will be required to to hold it in place.

Clive

[John Mellor 1Participant @johnmellor1]

Thank you for your answers Clive, Gerrard and Brian. The spindle is hollow. The mandrel end is threaded to take a draw bar. The diameter of the parallel part of the collet shape on the end of the mandrel is 16mm. Does that make it ER16? I have looked through all the information and pictures on lathes.co.uk and this is the very mill that is featured there. I will use a draw bar and give it a try. The spindle bore is a little over 16mm. The shape on the end of the mandrel has been turned not ground.

[John Mellor 1Participant @johnmellor1]

https://youtu.be/UMRR-vcOiJA

to see the mandrel and spindle nose more clearly

[Dave HalfordParticipant @davehalford22513]

That taper looks like a smaller version of the R8, I wonder if Bridgeport pinched it?

[John Mellor 1Participant @johnmellor1]

Hi Dave, The arbour end is shaped like a collet, 16mm parallel part with internal thread for a draw bar and then the taper at the end. R16 springs to mind but I could be wrong, cheers, John

[Pete RimmerParticipant @peterimmer30576]

I would turn a nose piece to screw onto that square thread and seat against the shoulder then mill the driving flats into it and bore it out so the collet passes through. The collet would then pull the arbor into the taper for good concentricity but the driving would all be done by the driving flats.

Edited By Pete Rimmer on 24/02/2022 17:20:53

[John Mellor 1Participant @johnmellor1]

Hi Peter, thank you for your suggestion. I would love to turn a noise piece but do not know how to turn a square form internal thread and certainly not up to a blind hole. The best I could attempt is something that is a snug fit over the threads held on with grub screws or with inset legs that run in the thread if that is considered robust enough. Cheers, John

[Pete RimmerParticipant @peterimmer30576]

It's a worthy project send me the dims and I'll turn one for you.

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