New Project - AXA Multifix

[thestelster]

Hey @thestelster,

Your holder is labelled AXA a d you seem to refer to that like AXA is a company.

But given that AXA, BXA, CXA, etc are also common sizes of toolposts, I can't help but wonder if there is a connection there. What size equivalent are those holders of yours? Are they like the AXA many guys on here have or are they much bigger? They look MUCH MUCH MUCH bigger!

AXA is a company: AXA-Entwicklungs-und Maschinenbau GmbH (www.axa-maschinenbau.de) If you go to the either of the websites I mentioned and they will have a PDF catalogue. If you go to the Stahlhalter24.de there is a blue box at the bottom right where you can get the brouchure. They have 8 different sizes that will accomodate tool bit sizes from 6mm to 63mm.

 

[PeterT]

I've never found an article or description of who started the ABCD sizing designation/standard. I've read it was Aloris & they had patents in the 50's & expired. Anyways I think its mostly N-Am-centric thing? The big names like Aloris & Dorian have had it for a long time. To complicate matters, I'm not sure if the copycats have truly adopted the dimensions &/or mechanism universally. So yeah, 'AXA' is just coincidental that they both refer to lathe toolholders.

 

[VicHobbyGuy]

When I looked at the Multifix info from those German sites, I found it strange that the toolholders are "sized" by lathe power (kW/H.P.) and tool size.

 

[thestelster]

Yesterday I drilled & tapped the compound, drilled and counterbored the t-plate. Milled and then surface ground both as a unit. I just have to drill and ream the top plate for 10mm dowel pins. I'll be getting the pins and reamer today. All is looking pretty good.

 

[thestelster]

Drilled and reamed the t-plate, 10mm anti-rotation dowel pin installed. Set up a number of tools to center height. Now to use it!

 

[jcdammeyer]

Drilled and reamed the t-plate, 10mm anti-rotation dowel pin installed. Set up a number of tools to center height. Now to use it!

No no no no no no no! Now you have to be like the rest of us and let it sit for 6 months looking pretty.

 

[thestelster]

Making a split bushing for the Multifix boring bar holder. 40mm OD, 1" ID, 130mm in length. Making it out of Uddeholm Ramax HH stainless, pre-hardened to 340HB. I'll hone the bore and slit it tomorrow.

 

[jcdammeyer]

Making a split bushing for the Multifix boring bar holder. 40mm OD, 1" ID, 130mm in length. Making it out of Uddeholm Ramax HH stainless, pre-hardened to 340HB. I'll hone the bore and slit it tomorrow.

Even used more than one tool holder. Congrats.

 

[PeterT]

Nice tooling. Should last you an eternity of happy machining.

 

[thestelster]

I have to open the bore of the bushing by about 0.0015" to accept 1" tools. Tool post grinder won't go that deep, and the Sunnen hones I have only go up to around 0.800", so I have to use the brake hone.

 

[Susquatch]

Making a split bushing for the Multifix boring bar holder. 40mm OD, 1" ID, 130mm in length. Making it out of Uddeholm Ramax HH stainless, pre-hardened to 340HB. I'll hone the bore and slit it tomorrow.

Yup! First job for every tool should be to make another tool for the tool........ LOL!

Looks great Stelster!

 

[PeterT]

I have to open the bore of the bushing by about 0.0015" to accept 1" tools. Tool post grinder won't go that deep, and the Sunnen hones I have only go up to around 0.800", so I have to use the brake hone.

I'm kind of interested in this, more for model engine cylinders. Do you mean you have a Sunnen hone machine & tooling but for that particular diameter is somehow depth limited? Or is it some other kind of Sunnen honing tool that is meant to be mounted similar to your (I'll call it a brake cylinder style hone) shown in your picture? Reason I ask is seems like model engineers that use the sprung, tri-stone type hones seem to always encounter bell-mouthing issues. On my radial I used brass Accu-lap, good control & finish but brutally laborious process to remove a thou.

 

[thestelster]

I'm kind of interested in this, more for model engine cylinders. Do you mean you have a Sunnen hone machine & tooling but for that particular diameter is somehow depth limited? Or is it some other kind of Sunnen honing tool that is meant to be mounted similar to your (I'll call it a brake cylinder style hone) shown in your picture? Reason I ask is seems like model engineers that use the sprung, tri-stone type hones seem to always encounter bell-mouthing issues. On my radial I used brass Accu-lap, good control & finish but brutally laborious process to remove a thou.

Hi Peter, have a look at this thread that I posted a little while ago https://canadianhobbymetalworkers.com/threads/honing-bores.5591/
I also have the Sunnen Porta-Hones. But because I use the hones for shotgun barrels, the bore diameters I can hone is from about .5" - .8". Yes, those spring hones will generally follow and existing bore, even its crooked, and they can bell mouth. You just have to keep the whole stone within the bore, ant not coming partially out, if you get my drift.

 

[thestelster]

Machining the relief slot, and through cut. Suggested speed for this 3" slitting hss blade is 61 rpm. Lowest on the mill is 100rpm, so had to change the VFD from 60Hz to 36Hz. Checked it with my laser tach, and was at 55rpm, close enough.

 

[thestelster]

Houston, we have a problem.

After slitting, removing the burrs, and cleaning it up, it appears to have sprung about 0.002" closed. So now the bore is 0.998" and a 1" tool won't fit. Of course in the Uddelholm brochure for this metal says to stress relieve it after rough machining at 985°F for 2 hours.

So now to decide my options. Maybe just enlarge the bore? But the OD of the bushing is now 0.002" less than 40mm for the boring bar holder. But it probably has enough clamping movement for it to still grip the bushing.

 

[jcdammeyer]

Houston, we have a problem.

After slitting, removing the burrs, and cleaning it up, it appears to have sprung about 0.002" closed. So now the bore is 0.998" and a 1" tool won't fit. Of course in the Uddelholm brochure for this metal says to stress relieve it after rough machining at 985°F for 2 hours.

So now to decide my options. Maybe just enlarge the bore? But the OD of the bushing is now 0.002" less than 40mm for the boring bar holder. But it probably has enough clamping movement for it to still grip the bushing.

What if you press in a 1" ID shaft? Then bring it up to 985°F for 2 hours. Then press out the shaft. Can't hurt.

 

[Susquatch]

Houston, we have a problem.

How much of the bushing is actually sprung? Could that part be Yielded?

Couldn't you just put a 1 inch bushing into it to stress relieve it?

Or how about a screw (or three) to push it apart as needed?

 

[thestelster]

What if you press in a 1" ID shaft? Then bring it up to 985°F for 2 hours. Then press out the shaft. Can't hurt.

I don't have an oven to get to that temperature.

 

[thestelster]

How much of the bushing is actually sprung? Could that part be Yielded?

Couldn't you just put a 1 inch bushing into it to stress relieve it?

Or how about a screw (or three) to push it apart as needed?

A 1" shaft won't fit. I'm afraid that if I force it in, it might gall, and then you'll never separate them, or if you do, you'll end up damaging the interior of the bushing.

I actually have a hydraulic dent raiser for shot gun bores. I can put a spacer in (shotgun bores are 0.730" (12g)) and give it a go.

 

[thestelster]

I just measured the MT4 adapter bushing, and it is the same size as my new bushing, so the holder will clamp down enough to grip it.

Perhaps I just open up the bore so that it will hold the 1" tools and be done with it.