MadModder

Gallery, Projects and General => Gallery => Topic started by: Meldonmech on October 27, 2013, 12:15:38 PM

Title: Stent Tool and Cutter Grinder
Post by: Meldonmech on October 27, 2013, 12:15:38 PM
Hi Guys

                I was just trying to sort ought some of my photographs this afternoon, and however many times I do this there are those pics that seem to prefer hide and seek than be viewed. My PC has a mind of it's own and changes the location of pics I have filed. The pics I have discovered are of the Stent Tool and Cutter Grinder which I built some time ago. The slides were machined on the shaping machine then accurately hand scraped. A work head was constructed to take Myford collets and an indexing device fitted. The Myford spindle nose could also take a small chuck or tailstock type chuck. There are a pair of centers, not shown. Slide stops are fitted to adjust movement.
                  The machine was entered into The Midlands M.E. Exhibition at the time and achieved a Bronze Medal.
                                                             
                                                                            Cheers David
Title: Re: Stent Tool and Cutter Grinder
Post by: vtsteam on October 27, 2013, 02:10:16 PM
Looks great! :bow: :clap:
Title: Re: Stent Tool and Cutter Grinder
Post by: philf on October 27, 2013, 02:28:07 PM
Hi David,

Very nice.  :thumbup:

I've just looked at the price of the drawings and castings - £300 + VAT so I don't think I'll add one to my list of things to make.

I thought it might make a useful compact surface grinder with a few mods to increase the spindle overhang.

 :beer:

Phil.
Title: Re: Stent Tool and Cutter Grinder
Post by: mattinker on October 27, 2013, 02:38:14 PM
David

Very nice build!

Phil,

Have a look at the "Bonelle" it's made from bar stock and the plans are free on the web.

http://homepage.ntlworld.com/j.b.d.willis/bonelle_tcg.htm

Regards, Matthew
Title: Re: Stent Tool and Cutter Grinder
Post by: philf on October 27, 2013, 02:50:32 PM
David

Very nice build!

Phil,

Have a look at the "Bonelle" it's made from bar stock and the plans are free on the web.

http://homepage.ntlworld.com/j.b.d.willis/bonelle_tcg.htm

Regards, Matthew

Hi Matthew,

I already have a Quorn on which the Bonelle is based but neither are really suitable for surface grinding.

I also have (what I think is) a Union T&C Grinder but without a great deal of work I can't get a wheel in the correct position for surface grinding.

Do I really need a surface grinder? Having had access to one at work before I retired I miss being able to use one. But I've managed without for 4 1/2 years so..........

Cheers.

Phil.
Title: Re: Stent Tool and Cutter Grinder
Post by: unc1esteve on October 28, 2013, 04:25:17 PM
Philf,
By reversing the motor/spindle and adding a way of moving the workhead, such as a lead screw, I believe the Bonelle coud be modified to to able to surface grind small parts.  I am going to put this on my modification list.
Title: Re: Stent Tool and Cutter Grinder
Post by: philf on October 28, 2013, 05:08:03 PM
Philf,
By reversing the motor/spindle and adding a way of moving the workhead, such as a lead screw, I believe the Bonelle coud be modified to to able to surface grind small parts.  I am going to put this on my modification list.

Hi Unc1esteve,

The Stent still looks ideal for a mini surface grinder. I found a fabricated version of the Stent using round bars for guides a la Quorn/Bonelle but the dovetail version looks more workmanlike.

Cheers.

Phil.
Title: Re: Stent Tool and Cutter Grinder
Post by: unc1esteve on October 28, 2013, 08:55:19 PM
The more I think about it the less I like my idea.  It would be better to make a dedicated surface grinder.
Title: Re: Stent Tool and Cutter Grinder
Post by: mattinker on October 29, 2013, 01:14:17 AM
A dedicated machine sounds like a good idea if you've already got a T&G. I've got a Clarkson MKI which I could use as a surface grinder, but I feel I'd really need to surface grind something to go through all that hand feeding!

An interesting project, keep us informed!

Regards, Matthew
Title: Re: Stent Tool and Cutter Grinder
Post by: Fergus OMore on October 29, 2013, 04:03:50 AM
In a bit of correspondence to one of you, I mentioned that putting a magnetic table on a Clarkson is my  'norm'.

However for those with a Quorn, Philip Amos did a write up and fitted his grinding bit of the machine to a mill.

Again, the Stent 'pillar' will accept the Quorn or its own stuff to act like a vertical slide on either the lathe or the mill or even a shaper.

As a bit of an aside, the Stent is calibrated whilst my Clarkson 1 has no such additions.

Hope this helps

N
Title: Re: Stent Tool and Cutter Grinder
Post by: unc1esteve on October 30, 2013, 02:10:02 PM
Phil,
What would be the needed x-y-z travel?
Title: Re: Stent Tool and Cutter Grinder
Post by: philf on October 30, 2013, 02:26:34 PM
Phil,
What would be the needed x-y-z travel?

I haven't given it that much thought but I have a 200mm x 100mm magnetic vice so I imagine minimum travels x - 250mm; y - 120mm; z- 150mm.

I have the basis of a floor standing machine which could give me x - 350mm; y - 150mm; z - 300mm.

Cheers.

Phil.
Title: Re: Stent Tool and Cutter Grinder
Post by: Meldonmech on November 05, 2013, 09:26:45 AM
Hi Guys

                           Thanks for all your comments

                                                                         Cheers David