Search found 51 matches
- Mon 13 Sep , 2021 14:24 pm
- Forum: Novamill
- Topic: Novamill - maximum spindle speed?
- Replies: 11
- Views: 15311
Re: Novamill - maximum spindle speed?
Tom, that's really interesting! That must mean that the drive is doubling the drive voltage at its output - I assume this is on a 230 V mains supply? I think if I could run at double speed it would meet most of my needs.
- Fri 03 Jul , 2020 8:47 am
- Forum: Micromill / Microturn
- Topic: Micromill based on Taig?
- Replies: 1
- Views: 7063
Micromill based on Taig?
A friend has what is definitely a Taig / Peatol mill CNC converted in an enclosure labelled "Micromill" - did Denford make any MMs based on the Taig? I thought the machine was based on the Sherline.
- Thu 24 Oct , 2019 11:44 am
- Forum: Novamill
- Topic: Novamill Column Raising Block
- Replies: 48
- Views: 51863
Re: Novamill Column Raising Block
A possible alternative approach, though it gives less benefit, is to use finger collets direct in the spindle. I bought a set of these from China, they effectively give an extra 50mm daylight.
- Thu 16 Nov , 2017 10:27 am
- Forum: Novamill
- Topic: Novamill headroom
- Replies: 4
- Views: 9034
Re: Novamill headroom
OK, thanks for that information - sorry for my slow reply! As you say, a bit pricy! Maybe I'll just make something...
- Wed 25 Oct , 2017 11:23 am
- Forum: Novamill
- Topic: Novamill headroom
- Replies: 4
- Views: 9034
Novamill headroom
I think we all know that there isn't much room under the spindle, especially when you mount a typical BT30/ER16 collet chuck in it. I have been looking in vain for a short chuck - it is possible to get very low overhang BT40 chucks for ER25 and ER32 collets such as this: https://www.cutwel.co.uk/too...
- Fri 27 Jan , 2017 12:09 pm
- Forum: Novamill
- Topic: Novamill - maximum spindle speed?
- Replies: 11
- Views: 15311
Re: Novamill - maximum spindle speed?
Hmm... Well I was quite happily running a 1 mm endmill at 5000 rpm and taking 0.5mm cut in brass at a maximum feed rate of ~80 mm/min. I didn't break any cutters in 8 hours odd running. I needed to clear out 1.5 mm of material, and needed a 1mm cutter for the required detail. If I took 0.1mm cuts it...
- Fri 27 Jan , 2017 10:15 am
- Forum: Novamill
- Topic: Novamill - maximum spindle speed?
- Replies: 11
- Views: 15311
Re: Novamill - maximum spindle speed?
I just wanted to resurrect this thread. I'm happily using my Novamill for 4 years odd now, but finding that the maximum spindle speed is a limitation. I'm usually cutting aluminium, sometimes brass, running the spindle flat out. I did a nameplate engraving job over Christmas using a 1mm cutter runni...
- Tue 24 Sep , 2013 15:39 pm
- Forum: Denford Classifieds
- Topic: Denford Triac 1985
- Replies: 3
- Views: 4422
Re: Denford Triac 1985
Is this still for sale please, and do you have a price in mind?
Re: Backlash
That's encouraging! I will check the thrust bearings and gibs.
Thanks, John.
Thanks, John.
Re: Backlash
Thanks, worth a try. But presumably the ballscrews aren't perfect anyway, do you know what the spec is for them, or what might be achievable on the Novamill please?
John.
John.
Backlash
Having had a couple of unexpected small tolerance issues, and being a newbie to CNC milling, I realised that backlash could be the problem. I measured the backlash at 0.03 mm on X and Y, and about 0.02 mm on Z. Are these of the order to be expected on the Novamill please? I have switched compensatio...
- Sun 24 Jun , 2012 22:40 pm
- Forum: Novamill
- Topic: Cooling Novamill
- Replies: 1
- Views: 3242
Cooling Novamill
I recently did some engraving on my Novamill, which took a long time running the spindle at max revs. The headstock and the top of the column were pretty hot by the time I finished and it seems to me that the drive motor could do with some cooling as the column space has no venting to the outside. I...
- Fri 20 Apr , 2012 15:13 pm
- Forum: Novamill
- Topic: Spindle lock
- Replies: 2
- Views: 3392
Re: Spindle lock
OK, thanks for thinking about this...I'll watch out for it happening again.
John.
John.
- Thu 19 Apr , 2012 9:20 am
- Forum: Novamill
- Topic: Spindle lock
- Replies: 2
- Views: 3392
Spindle lock
The other night I was in the process of referencing a piece of work using a wobbler, found that the collet chuck drawbar was only hand tight so applied a couple of wrenches to tighten it, then found that the spindle was seized solid! Groan, sigh, switched everything off (and yes, the spindle drive w...
- Fri 13 Apr , 2012 17:38 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
Trouble with worm is how do you preload it to take out the backlash but with minimal friction? One route could be to use a recirculating ball arrangement like the old steering mechanisms - effectively a ball screw where the "nut" is replaced with a worm wheel. I'm not sure if these can be bought, lo...
- Thu 12 Apr , 2012 12:19 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
That's a good idea.
- Wed 11 Apr , 2012 16:11 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
Thanks Mike! I gether this supplier has resellers in France and Spain which I guess is why he is quoting euros. Food for though...when I built my drive box I included a 4th axis driver which is all ready to go but then started thinking about backlash etc so this might be a possibility.
John.
John.
- Wed 11 Apr , 2012 12:31 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
Mike, it's an interesting idea to make one using a harmonic drive. I've contacted the company but of course they ask which drive I would want! Did you specify a type number please? I wondered if there would be a few people interested in making one of these, to make it worthwhile buying a few drives ...
- Tue 03 Apr , 2012 22:19 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
Thanks! I had a hunt but didn't find that one, wasn't using the right search terms.
John.
John.
- Tue 03 Apr , 2012 17:02 pm
- Forum: Novamill
- Topic: Novamill Gets a 4th axis!
- Replies: 23
- Views: 19446
Re: Novamill Gets a 4th axis!
Mike, was that a 1-off from ebay or are they regularly available please?
John.
John.