Design Discussion: High Performance CNC Spindle

January 22, 2020, 2:38 pm

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I have been doing research on building a high performance spindle for a medium to large size benchtop CNC mill for a few months. I recently found out that @shooter123456 was also working on similar goals and I wanted to create this post to collect information and share ideas. I'm sure he and I have slightly different end goals in mind, so I will try to keep this generic.

Background: Anyone who has converted or built a benchtop CNC (up to RF45/PM-940 size) is likely...

Design Discussion: High Performance CNC Spindle

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Where to next?

January 22, 2020, 3:28 pm

≫ Next: Convert Gear Diametral Pitch To Module.

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I purchased a "turnkey" CNC PM-25MV from ProCut CNC to make some parts that I had developed. There was much regret in that as the machine had to be torn down and reassembled properly before it was even usable. I will spare the details, just beware of their lack of pride if you choose to deal with them.

A Chinese PM1236 was also purchased (directly from PM) to aid in making said parts. With the exception of replacing some cheap hardware it has served me quite well.

Sales have slowed just...

Where to next?

Convert Gear Diametral Pitch To Module.

January 22, 2020, 5:05 pm

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Hello there,
I wonder if someone can help me. I have to a gear with 28 teeth and a 1.666"diameter. I want to cut an identical gear. I worked out that it has an 18.05 Diametral pitch. Converting it to module with my calculations it is a 1.4066 modul. My question is: should I use a 1.5 module or am I wrong? To get imperial cutters are very expensive, but the metric are cheaper.
Thank you
Jim

wnmg tool holder

January 22, 2020, 5:22 pm

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Does anyone know if anyone makes a wnmg holder for smaller lathes 10x22 in a 1/2 inch holder or 12 mm holder I would like to try these especially since one insert has 6 cutting edges but I'm having trouble finding anything under 3/4 thanks for any help

Etching Steel Using a 2.5 watt Diode Laser

January 22, 2020, 5:28 pm

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I recently purchased five pairs of 1-2-3 blocks. My intention was to use them for setups when machining. They arrived last week and on first inspection, actually looked reasonably good. I want to do more thorough metrology but thought that I should serialize them first.

A carbide scribe could do the job but the ridges that would result would have to be removed. My thinking turned to electrochemical etching. The process that I used was coating the work with a resist and scribing through...

Etching Steel Using a 2.5 watt Diode Laser

Preferred spotting for drilled holes?

January 22, 2020, 5:31 pm

≫ Next: What's the best way to clean this up?

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I run a smaller CNC and would like to preset a single tool to handle most or all of my spotting work. When doing general drilling I have always used a small center drill, but need to run high RPM's and find it doesn't clear chips well. I see NC spotting drills for sale in angles ranging from 90 degrees to 150 degrees. What would you recommend for a general purpose spot drill?

What's the best way to clean this up?

January 22, 2020, 5:39 pm

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I acquired this as part of one of the collections of random machinist tools I have. It may actually have come from my father in-laws set.

Everything functions smoothly, it has a nice feel to it. However the surface rust has made it pretty much useless. I had set it aside with the idea of some day bringing it back to usable condition. I like old tools and would actually use this if I could read it.

What's the best approach to clean it up?
Any advice on how to bring it back to life?

-Dave...

What's the best way to clean this up?

What's something like this worth?

January 22, 2020, 6:15 pm

≫ Next: Russian Boring Head...

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Looking at a used Kurt vise.
Seller says this about it...and has some pictures and it appears to have new paint.
is asking $275
Used Kurt D675 precision vice. New thrust washers and needle bearing. Mating surfaces have been honed.

Serial number #64764
Any way to judge the age from this number?

Mods: please remove if this type post/question is not allowed
Don't want to step on any toes here.
Thanks!

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Russian Boring Head...

January 22, 2020, 6:46 pm

≫ Next: Surface grinder $750 Tempe AZ

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OK, so I was buying some drill bits and a chuck from someone on Facebook Marketplace, and he brought along this boring head "kit" (although they didn't know that the parts all went together.

No markings!

Stainless. Uses a screw head (for adjusting) that I've never seen. It's hex, but tapered. Starts out at 3mm, gets larger (close to 3.75mm) at the bottom.
There's a cover that you ran rotate to cover/protect the adjustment screw. (at least that's my best guess)

I'm guessing this boring...

Russian Boring Head...

Surface grinder $750 Tempe AZ

January 22, 2020, 6:46 pm

≫ Next: Robin Renzetti shows how to properly rebuild precision spindles, a must see. Warning, 1.5+ hours...

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6 x 12 SURFACE GRINDER

6 X 12 Surface Grinder in good working condition. Comes with extra grinding wheels and metal base cabinet, also a 6 x 12 magnetic chuck. 3/4 hp 110v, $750.00

phoenix.craigslist.org

No connection to the seller, and I don't have any additional info.

Robin Renzetti shows how to properly rebuild precision spindles, a must see. Warning, 1.5+ hours...

January 22, 2020, 6:53 pm

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This is just incredible! Precision spindle repairs have been clan secrets among the pros in the business. Robin Renzetti sets it free here. Amazingly fine work with strict care to follow best practices, and more. Who says we cannot 'properly' rebuild our own spindles???

MT2 test bar review

January 22, 2020, 6:59 pm

≫ Next: Help trouble shooting a HF 125

≪ Previous: Robin Renzetti shows how to properly rebuild precision spindles, a must see. Warning, 1.5+ hours...

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I was having some problems with machining a longish (for me) shaft on my Atlas 618 and I've chased my tail on alignment issues, so I decided to get an MT2 test bar and figure out what was going on.

Bought this MT2 test bar from Amazon for $28

pics


[ATTACH type="full"...

MT2 test bar review

Help trouble shooting a HF 125

January 22, 2020, 7:22 pm

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Hi,
I was using my HF 125 today and all of a sudden it stopped working. My original thought was that maybe it had over heated some how. I had done 4 tacks and then about an inch long bead. Power on max and wire feed on four.

I have done the bridge rectifier/capacitor modification. The welder powers on. The fan runs. When I push the switch I hear a click and a buzzing sound. The wire does not feed. When I touch the wire to what I am welding there is a tiny spark.

Where do I start to...

Help trouble shooting a HF 125

Tramming

January 22, 2020, 7:29 pm

≫ Next: G0704 CNC Conversion (yes, another thread on this :) )

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Hello - I have a Johannson A37 (Clausing 8520). Does anyone have a hint on adjusting the nod other than disassembling and shimming - rinse and repeat. My head was out .030. I have it down to .003 - .004. but it sure is a lot of work to take the entire head off each time. Has anyone ever come up with adjustable spacers?
Thanks in advance!

G0704 CNC Conversion (yes, another thread on this :) )

January 22, 2020, 7:33 pm

≫ Next: Phase II Manual Arbor Press - $130 (san jose, CA)

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Well, since you guys did not let me buy an inexpensive metal lathe to play with (link to that thread)... decided to convert my G0704 to a CNC machine. Will document my journey with this project here.

Bought the machine back in 2015 (link to thread)

A few...

G0704 CNC Conversion (yes, another thread on this )

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Phase II Manual Arbor Press - $130 (san jose, CA)

January 22, 2020, 8:18 pm

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Phase II Manual Arbor Press

Phase II Manual Arbor Press in good condition. $130 IF YOU SEE THIS ADD ITS STILL AVAILABLE Call If you have any questions.

sfbay.craigslist.org

System crash

January 23, 2020, 11:54 pm

≫ Next: And a second "What is this lathe" thread.

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Did we lose today’s posts?


Sent from my iPhone using Tapatalk

And a second "What is this lathe" thread.

January 24, 2020, 2:40 am

≫ Next: Will a10" rotary table be too big for my Clausing 8520 ?

≪ Previous: System crash

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Same feller (grandson's buddy) second lathe he's come up with. This one seems a bit more complete.



Identification?

Will a10" rotary table be too big for my Clausing 8520 ?

January 24, 2020, 3:52 am

≫ Next: Powerkraft 10'' spindle issue

≪ Previous: And a second "What is this lathe" thread.

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Fellow close by has this for sale , I read in the Clausing paperwork that they had a 8" rotary table , I can't see what harm having the extra 2" be ? Maybe issues bolting it down ?

Phase II 10" diameter rotary table model 221-310
Msc # 09102583
Phase II tailstock model 240-001
Msc # 09102757

Powerkraft 10'' spindle issue

January 24, 2020, 5:40 am

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ive noticed in the past one time when I put a 3mt lil chuck attachment into the spindle I had big runout I blamed the lil chuck on being out of wack….recently I had to put a 3-2 adapter in there to machine a blank 2mt tool.. issues again..i bought a new 2-3 mt adapter as mine was old and looked welll beat up... now I think ive found my problem if you look down the spindle bore you can see a ridge... check the pics. its not even either it almost disappears in one area. im thnking the...

Powerkraft 10'' spindle issue