This type of compression bit might be good choice for a finishing pass.
So if I buy this and a Chinese spindle, I can run the spindle to 36k RPMs? What’s the upper limit of the spindle itself?
Oh wow! Those look really nice. Especially that 42k RPM and the 60k RPM! I just asked for quotes and I’ll share the prices I receive back here with everyone.
Note that the 60 kRPM versions only support small diameter endmills which preclude full utilization of their power capabilities because of Shapeoko force limitations. The 40 kRPM versions are available with ER20 (13mm capable) collets that could utilize the full spindle power capability for material like “soft wood” because of their support for larger diameter endmills. But, most endmills for wood are only rated for a maximum of 24 - 27 kRPM (as are most collets and collet nuts). Everything should be properly balanced and rated for operation at whatever speed you choose for safety and performance reasons.
Yep, that’s what I gathered too. I thought the 40k RPM spindle sounded most appealing.
Here are the prices I heard back with from them:
JGD-62/0.75R40 (speed 40k rpm)=265 USD JGD-62/1.0R60 (speed 60k rpm)=515 USD JGD-80/1.5R24 (speed 24k rpm)=305 USD JGD-80/1.5R40 (speed 40k rpm)=410 USD JGD-80/1.5R60 (speed 60k rpm)=660 USD 220V single phase VFD 0.75KW S0007=145 USD per pc 1.5kw S0015=155 USD per pc water pump=15 USD per pc spindle mount=20 USD per pc
All in all, 60k RPM is pricey but 40k seems to not be too bad. I may just settle with a 30k spindle, which is better than the 24k spindle most people get.
Did you ask about shipping costs? - Alibaba’s estimates are ~$500 to California!
Here’s some charts to help with speed, power, and collet size tradeoffs given the 20 lbf force and 200 IPM feed rate Shapeoko3 limitations. Also note that all of these spindles are significantly heavier than the trim routers. Mr. Beaver did a lot to adapt his “Monster” (yet incredibly light weight!) 5.5 kg “2.2 kW” spindle.
The charts are in order of decreasing material removal rate (MMR) and assume that the unit power for aluminum is 159 Watts per cubic inches/min. Chip-loads are all 0.0015"/flute for the maximum MMRs. Remember that the “1.25 HP” trim routers are likely only capable of 400 - 500 Watts cutting power.
Origin/consistency of chipload recommandations
I am asking about shipping right now.
Wow, that is some excellent info to know. I will want to stick to er16 or smaller for my own uses, that helps increase cutting forces.
So even if I go for the 1000 watt or 1500watt versions, it’s still way more capable than a trim router if I can match or exceed RPM range.
Hmmmm, seems the OP’s topic has been kinda hijacked.
@wingrider62, Jeff, anything new to report on the 800 watt?
Isn’t that better than letting it close?
Probably, I’ve learned a lot from everyone’s comments, thread is permanently bookmarked for me.
I’m just hoping to hear back from the OP on his experiences as I still haven’t seen any compelling reasons for me, personally, to use anything much bigger.
You should want to decrease cutting force, not increase it! Increasing speed and cutter size helps do that. Anyway, before seeing this video, I was looking at this 1100 Watt TeknoMotor spindle. Based on its performance curves, its capable of 1100 Watts cutting power from 18,000 - 24,000 RPM and it comes with a precision balanced ER20 collet nut and wrench. Based on Jianken performance curves, their “1500 Watt” constant torque JGD ER16 spindle is likely only capable of ~1300 Watts of cutting power at it’s maximum speed (40,000 RPM) for the one you’re likely considering.
The TeknoMotor spindle uses an electric fan for cooling and the Jianken spindle uses water. This video shows that, at 24000 RPM, Kress and Suhner routers as well as the Elte and Mechatron HF Spindles, which also have internal shaft driven fans (all routers do), are about 20dBA louder than the Mechatron water cooled and HSD electric fan cooled HF Spindles. A 20dBA reduction would be perceived as 1/4 as loud.
The VFDs for both spindles require a ~220V 15 Amp service. The TeknoMotor spindle weighs 4.3kg (about twice as much as the Dewalt) and the Jianken weighs 6 kg. The cylindrical Jianken’s mounting bracket would likely add significantly more weight than anything necessary to mount the rectangular TeknoMotor. Regardless, the added weight may be problematic for either option. Unlike the US distributer for TeknoMotor, which never provided the quote that I requested, the one in the Netherlands has been very responsive. The cost for a complete system setup, wired, tested, and delivered to California would be ~$1100.
Their “Standard Swiss precision” ER20 collets which are “recommended by TeknoMotor” are less expensive than the comparable “ultra-precison grade” collets from PreciseBits. [Section 8.6] of the TeknoMotor handbook stresses the importance of using precision collets, as does Vince (albeit indirectly).
Based on the following charts which compare the two options, the TeknoMotor is the better choice IMO. Its 18% decrease in MMR for Aluminum and hardwoods is more than offset by the its 57% increase in MMR for softwood and by its decreased weight. The convenience of effectively supporting standard router and CNC bits with 1/2" shanks is an added bonus. Both options offer MMRs more than twice that possible with the “1.25 HP” (400-500 Watt cutting power) trim routers, as well as much lower noise and much improved precision.
Have you heard back on shipping costs yet?
IMO, the 1000 Watt 60,000 RPM Jianken JGD water cooled spindle with an ER11 collet may well be the best choice for use on Shapeokos, especially for those milling Aluminum. It weighs only 7.3 lbs, so the standard Z axis should be compatible (even without stronger lift springs). It’s 62 mm diameter will fit in the Makita router mount (shim material may be required). Since it runs twice as fast as the Makita, it halves the cutting/machine forces or doubles the MRR. It’s low enough power that a transformer could be used to provide the 220 V required from standard 115 V circuits. But, endmills capable of 60,000 RPM have to be used.
Here’s its data sheet:
Here’s how it would and the 1500 Watt version would perform:
Here’s a compatible VFD
FYI, I’ve opened a dialog with the referenced supplier, https://www.aliexpress.com/item/32946577194.html?spm=2114.search0188.8.131.52d15295LUHgDl&transAbTest=ae803_3
Just for kicks.
Attention all shoppers, someone is selling a water cooled 2.2kW spindle for $300 on Inventable forum.
I am working on that. I asked a few questions and they got hung up on one I need to clarify but am traveling right now so it’ll be a few days until I can remedy it.
I’m curious to hear what you hear back Griff.
60k???..yes it’s a complete sentence
Oh, they have a version with an integrated tool changer now too:
That has possibilities.
Here’s some more details on that router.Kress Instruction Manual.pdf (314.1 KB)