Search found 46 matches

by hanermo
Wed Oct 30, 2019 9:22 am
Forum: Gunsmithing
Topic: 1911 Project
Replies: 42
Views: 7125

Re: 1911 Project

Wonderful !

I learn tons from this stuff - although I cannot do anything related to guns here in Spain.
by hanermo
Wed May 15, 2019 10:36 am
Forum: General Discussion
Topic: VFD question
Replies: 31
Views: 6406

Re: VFD question

Cheapish chicom inverters to 220V ac are available on the chinese bulk sites like aliexpress. To 16 kW, peak, at least. Maybe use one to feed the vfd, 220v, and a cheap 3 phase industrial motor, used. The dc inverter, vfd inverter, and 3-phase motor of == 20-30 hp industrial, continuous output, shou...
by hanermo
Wed Oct 31, 2018 4:11 pm
Forum: Riding Scale Railroading
Topic: Electric motors
Replies: 7
Views: 3288

Re: Electric motors

Mr ron .. most motors apart from modern ac brushless servos have very low torque at low speeds, and usually high heat. For traction apps like a train, you do not want a high rpm motor. It is not hard to make a gearset to step down the speed, but it is VERY very very hard to make one able to deal wit...
by hanermo
Tue Oct 23, 2018 1:41 pm
Forum: The Junk Drawer
Topic: Tesla cars
Replies: 57
Views: 19495

Re: Tesla cars

Fwiw ... I followed tsla quite closely for about 3 years, starting from expecting them to be a useless joke, before knowing anything about them. What tsla does better than anyone else is; 1. - the vfd electric drive for the motors. Mass == 30 kg, cost == 500$ marginal, 300 kW+ peak, size of small ov...
by hanermo
Thu Jun 14, 2018 2:28 pm
Forum: General Discussion
Topic: Drilling Concrete
Replies: 35
Views: 5369

Re: Drilling Concrete

My experiences are mostly with steel around 13.000 drilled/tapped holes in tool steels upto 16 mm, but some 18-20 mm holes 300 mm deep in concrete. The same applies to both jobs. It is quite easy to drill a 5-6 mm starter hole as deep as needed. It is then about 4-10x easier to drill a 18 mm hole af...
by hanermo
Thu Jun 14, 2018 1:31 pm
Forum: Milling Machines
Topic: Milling a helix
Replies: 67
Views: 21210

Re: Milling a helix

So the feed rotates the blank, via gearing, thus making the feed/rev constant, no ?
While the feed advances at a given steady rate.

Excellent job. Imo.

You mentioned full-depth cutting.
Did you actually cut the full depth of the helix in one pass ?? !! ??

At what speed in rpm if I might ask..
by hanermo
Sat Oct 28, 2017 2:36 pm
Forum: General Discussion
Topic: TIR
Replies: 21
Views: 3326

Re: TIR

All spindles have some runout in TIR. Say 0.1 microns for a Moore Nanotech, or airbearings for diamond turning optics (or semiconductors etc). 1 Micron for best smallish common 12" lathes (Hardinge HLVH, Monarch 10EE, Star (Hardinge copy), Wheeler, etc.) 2-4 microns any good workshop lathes, includi...
by hanermo
Sat Oct 28, 2017 2:00 pm
Forum: Riding Scale Railroading
Topic: The Viability of Solid-State Components for Signal Systems
Replies: 27
Views: 7203

Re: The Viability of Solid-State Components for Signal Systems

This is one of the 4 best OP posts I have ever seen on any subject. Kudos. The others, +/- chronological, -5bears cnc. Best early cnc build ever. -Dan Gilbaert on prototypes, cnc etc. Best shop built cnc ever. (I am doing similar stuff.) -Ted Talk by 15 year old who dug up uranium, refined it to yel...
by hanermo
Sat Sep 30, 2017 1:13 pm
Forum: General Discussion
Topic: If you need a good laugh...
Replies: 18
Views: 3628

Re: If you need a good laugh...

I don´t see a problem. A learning opportunity- yes. A thin cutting wheel + 4.5" or 9" grinder will easily chop it. Use shielding for eyes etc. !!! Rotate often. A temp steady rest is easy to make. Use flat cold-rolled steel pieces, bolted together. Just drill/tap, and allow final fits to be by bolts...
by hanermo
Fri Feb 03, 2017 10:57 am
Forum: General Discussion
Topic: Best turning method regarding stress relief
Replies: 24
Views: 2771

Re: Best turning method regarding stress relief

The part is really thin, and alu.
A hole saw will work fine, in a lathe.
About 80 rpm.
Use 2 - 3 relief holes, and it is half the load.

I have done similar in steel, even on a drill press (too fast in rpm).
The holes make a huge difference.
About 10 mm relief holes, internal sides of the slug.
by hanermo
Tue Nov 29, 2016 10:25 am
Forum: Lathes
Topic: lathe motor 3ph vs. single phase and low rpm
Replies: 24
Views: 4564

Re: lathe motor 3ph vs. single phase and low rpm

Somewhat as others have said... 1. An RPC is quite good, and very cheap. Likely your best choice bang /buck. 2. A new VFD is cheapish, and will provide several benefits, and better low end torque, and soft start/stop and auto reverse. 3. A brushless ac servo drive + motor is the best option. By far....
by hanermo
Thu Aug 11, 2016 10:51 am
Forum: General Discussion
Topic: Cut Down OD of MC Shock Spring on Lathe?
Replies: 13
Views: 2425

Re: Cut Down OD of MC Shock Spring on Lathe?

I don´t know if its a good idea to do this or not. However, a good/large flat belt sander or stationary sander or flap wheel on a 41/2" grinder will easily, and in a very controlled manner, reduce the OD. I am experienced, and use a festool sander, best there is, 1400W. Nevertheless, using permanent...