Thread: RFQ - custom 43mm spindle mount
Guys, I've just ordered a small CNC machine from Asia (http://www.ebay.co.uk/itm/Panther-21...item35b56aeb53) & now need a spindle mount to affix my Proxxon BFW40/e to it ( http://ebay.bzt-cnc.de/sc/zubehoer/proxxon/bild1.jpg ...this Proxxon spindle has a 43mm collar.
Here's the overall vibe of what I'm thinking...
(I've omitted the clamping aspect...as I'm figuring who ever is confident enough to quote me will also be confident enough to put their own clamping arrangment in place! The key thing is those m5 holes - they've got to be bang on (71mm between centres - here's the manafacturer's Z plane mounting plate drawing - http://www.motor-star.com/Z%20AXIS%2...LE%20-%201.jpg ).
Re spindle mount thickness...hmm, difficult, my spindle is quite chunky at 2kg (far too big for such a little machine really), so I don't want a *huge* amount of weight attributed to the mounts alone (although I'm conscious of the heatsinking 'win' a larger mount brings) ...but it'll probably need to be something 25mm thick?
Anyway, my 'first stab' DXF file is attached which has all the dimensions.
PM me if interested....don't spend overly long ...a ballpark figure via PM would be nice to kick this off! (also don't be offended if I baulk - I was made redundant in June - living off my savings - no benefits for Hank! - & I'm presently try to dig myself out of this mess by getting some piddly little products to market! I can actually mill my own mount out of mdf or acrylic, but would rather have Ali)
Last edited by HankMcSpank; 20-10-2011 at 11:31 PM.
My machine is down for a little repair/mod or I would quote you for one, got some 25mm alu in the shop. I'm sure Jonathan will be along soon to have a look at it. My plan as well was to do some motor mounts for ebay perhaps but we will see how that goes.
I have had a play with your dxf and I think you may have a problem with getting 5mm bolts into the holes. I take it you would be using a 25 to 30mm long bolt depending on the thickness of the tool post you are bolting on to. You might need to reduce your outer diameter a bit to be able to get the bolts in without them hitting the side of the mount. But then again you could always mount studs in the tool post then just fit nuts to clamp the mount to the post. Might also be better to make the holes 1mm larger diameter, this will give you a bit of adjustment. The 71mm pitch isnt a problem, you can just mill a drilling jig to get it spot on if you really want to.
The Following User Says Thank You to Web Goblin For This Useful Post:
Good spot with the mounting bolts., I'm liking what you've done...
In this fine forums' opinion, would 25mm be about right for such a mount? (just checked the spec 4.2kg of my spindle ....yikes, no wonder my CNC Z plane stepper was struggling on my homemade machine!). Also, I need that amount of 'throw' from the back of the mount to the spindle centre (because the upper portion of Proxxon spindle measures about 82mm diameter) ...just wondering about the mount's weight here ....would it be worth removing some material out of that long back edge (a recess?!) to remove some weight from the mount?
Last edited by HankMcSpank; 21-10-2011 at 09:08 AM.
19mm or 3/4" would be fine, there,s nothing there in the extra 6mm or 1/4" that will add anything to the design.John S -
The Following User Says Thank You to John S For This Useful Post:
I have some 3/4" aluminium, so I could cut you one from that. Also got some 1.5", but that's a bit much...especially as that bolt has to squash it to clamp which is going to take more force with a greater thickness. Could have more bolts if it was thicker though. Two clamping bolts could fit with 3/4" but I doubt it's necessary.
The problem with me doing it is I'm at University so I can only come home to do it some weekends. Got some bits to cut out for luke11cnc next weekend and a spindle mount... so if you don't mind waiting a couple of weeks I can do it.
Last edited by Jonathan; 26-10-2011 at 10:00 PM.
Looking for a drawing I did a while ago and came up with this picture.
Not suitable for your use because you can't get the centres in you need but it was an exercise on keyhole milling to get water passages nearly all the way round the mount to keep the Kress bearings cool.
Not sure if any are left but i don't use my Kress now I have the high speed spindle so I'll do a search and see what I haveJohn S -
Loving the name - waterkress! lol LOL. (I don't get out much)
Thanks for the input guys...sheesh I don't know, here was I thinking you were all stood to attention, polishing your machines while waiting for the next job to come in; -)
The situation is, my machine won't even be despatched for two more days....it's coming from Korea (I like to buy from countries associated with top engineering quality hehe!) ...so I'll likely not have it for 7-10 days, but man, it's going to be painful to have it here & not be able to use it......remember - I've been 2.5 years using my homemade CNC constructed from junk (and the end result wasn't far from the input material!) - I'm gonna be like a sailor who's been at sea for three months, pulling into the harbour at Rio de Janeiro & who's just swallowed a tablet of Viagra.
Sure that's enough rotary tables!
I notice you've done the other clamping method. I wonder which way is strongest.
Don't know about strongest, with the clamp method once the slit is compressed that's it.
With the cotter method there is no limit how far you could pull it thru or better to say how much damage a ham fisted ijit could do.
1001 post, need another bicky.John S -
By martin54 in forum Marketplace DiscussionReplies: 14Last Post: 19-01-2016, 08:09 AM
By Doddy in forum Projects, Jobs & RequestsReplies: 3Last Post: 05-02-2014, 05:42 PM
By Tom in forum Items On eBay UKReplies: 0Last Post: 12-11-2013, 08:31 PM
By cncJim in forum Marketplace DiscussionReplies: 2Last Post: 19-06-2013, 07:58 PM
RFQ: Spindle mountBy jcb121 in forum Projects, Jobs & RequestsReplies: 4Last Post: 05-02-2012, 01:49 PM