Hello Have anyone tried this approach to mounting an 43mm spindle, AMD/Kress etc? It’s essentially just a colletring with ID=43mm and OD=80, clamped in the Onefinity 80mm mount. Terje [onefinity_spindle_holder] [onefinity_spindle_holder_cut1] [onefinity_spindle_holder_top] [onefinity_spindle_holder_cut]

Hey Terje, yes, some of us have expressed both the need for it, as well as the plan to implement it (if someone can find the time), see here: 43 mm mount Euro mount I personally think it’s a big mistake on Onefinity’s part not to offer an optional 43 mm mount, because with such an “Euro” mount, one would not only have a variety of milling motors as AMB (former Kress), Suhner, Mafell, etc. to choose from, but also a drilling machine with reduction gears (for drilling holes at very low speeds). These are very nice pictures you created! Do you also have the capability to mill this in aluminium? :slight_smile: Or a lathe to turn it? If not, one idea I had was that one could buy this 43 mm mount and file off the overhang until it is 80 mm in diameter so that it fits into Onefinity’s mount. It’s already 80 × 80 mm in size!

Ahh, the lovely Kress type spindle shows up again! BTW, nice modeling @Temo! This could be easily machined out of Corian, which is suitable in a compressive application like this, but many other materials would be suitable as well. The only potential issue I can see is that the distance from the nose of the collet to the bottom of the Onefinity spindle holder is pretty close, and won’t reach down to the work at the bottom of the Z travel. This would result in virtually no usable Z travel. By contrast, a router or spindle drops thru the holder quite a distance so will reach the work surface. [PXL_20220912_004719993]

Hey Bill, hey Terje, but the other day we discussed that the need to slide the router or a 65 mm spindle that much downwards in the mount, with the result that the distance from bit to mount becomes “5″ish” as you called it (=12.7-cm-ish :slight_smile:), because otherwise the milling motor’s back would bump the Z stepper cage, is a strong disadvantage in matters of rigidity and chatterproofness. But you are right, the opposite, I mean zero distance, would be a loss of Z travel. But that is due to the design of the Onefinity milling motor mount. It differs much from the usual spindle mounting plates (see links below) in that it does not protrude downward beyond the Z-rails end. Not at all. It leaves it up to the milling motor to protrude the Z assembly downward, and that is a severe disadvantage that costs Z travel if you want the collet to be close to the milling motor mount for matters of rigidity. Usually gantry-type CNC machines are made so that the spindle mount is attached to a moving mounting plate that is able to protrude much below the Z assembly: [image]Machinist in X-50 [z_axis_cnc_router_high_z_t_series_50pct] In this image you can see that this way a zero distance between milling motor clamp and motor axle output is implemented. You can see a video of a moving spindle mounting cage here (shows Sorotec Alu-Line Z Assembly) On Onefinity, the distance from mount to collet with a 80 mm spindle that people use is seen here and here. @Temo I think that if you mill or turn such an adaptor ring I would use the full height of the Euro neck. Generally I think the problem is the Onefinity Z assembly itself (and this is not the first time I think this way). Anyway I think that a one-piece, dedicated 43 mm mount, machined and offered by Onefinity, would be a better solution than an adaptor ring inside the 80 mm mount. But I think for myself when the time comes I will see if I simply replace the Z assembly. There are many offered and Onefinity’s rectangular X gantry block should make it easy to attach one. You can see many third-party Z axis assemblies here: Universal Z Axis Assembly Has anyone replaced their Z axis assembly for greater travel? Any hobbyist grade solutions for adding automatic tool changes to onefinity?

Thanks everyone, I guess it wasn’t that easy if the spindle does not reach down. One would seriously have to butcher the 1F 80 mm mount to get this to work, and it would probably be to weak, but would be fun then! [onefinity_spindle_holder_43mm_tem] [onefinity_spindle_holder_43mm_top_tem]

I like this design, clean and simple. But I think the potential weakness may come from pushing the centerline of the spindle out yet farther from the support of the linear bearings. The dimensions shown here are just rough estimates based on scaling @Temo 's CAD view. I can’t find the actual dimensions now that were referenced in an earlier thread, but I believe the Onefinity 80mm spindle holder places the spindle centerline about 15mm out farther than the 65mm “standard” holder. This spindle would be approx. 41mm farther out from the current 65mm spindle (router) centerline. [image] EDIT: To clarify, I’m not saying that the 41mm offset distance is “too much”. Because looking at the 3D iso view of the design, it appears perfectly adequate and reasonable. If I’m being honest, it looks quite beefy in fact. The fact is that the Kress (or similar) spindle is far superior to a router, but how much will the 41mm offset difference play into the trade-off?

Hey Bill, [image] Machinist: I can’t find the actual dimensions now that were referenced in an earlier thread At your service :slight_smile:

[image] 349iq2345: At your service Ha! I knew you’d come through! :sunglasses:

Hey Bill, [image] Machinist: Ha! I knew you’d come through! :sunglasses: just coincidence that I saw your posting just when you posted it :slight_smile: . I also have to leave right now (until later). What I do is just eagerly use the bookmarks functionality of the forum :slight_smile: With the amount of knowledge that can be found in the forum, I highly recommend it

Going the other direction here is an 89mm 3d printed bracket I’ve been putting through its paces. 1/2” collet, 2.25hp and actually quieter than ye olde makita and no VFD. It is pushed out from the linear rails to clear the Z stepper and for sure rigidity takes a hit but I’ve been making some deep passes in hard maple and so far ok. 1F if you go start making alternative brackets add to the list?! [image]

So I had a go at a clean build, from the center of linear rod’s to center of spindle would be 74mm, the house is 63mm long. It should be very easy to make, and the bearing blocks come in many different sizes and versions. Now I just need to order my machine, I’ve landed on the Machinist version after going some back and forth with myself. Enjoy I forgot to give credit to the maker of the Kress spindle: Free CAD Designs, Files & 3D Models | The GrabCAD Community Library Credit goes where credit belongs, thank you! [Pillow Block Linear Ball Bearing ass for Kress front] [Pillow Block Linear Ball Bearing ass for Kress top] [Pillow Block Linear Ball Bearing ass for Kress]

43mm Euro spindle

Spindle/VFD (Aftermarket/Unsupported)

349iq2345 September 12, 2022, 1:48pm 7

Hey Bill,

At your service

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43mm Euro spindle

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