Search found 49 matches

by hanermo
Wed Jul 15, 2020 8:09 pm
Forum: Home Shop CNC
Topic: MACH3 and MPG Pendant
Replies: 18
Views: 771

Re: MACH3 and MPG Pendant

My €0.03.. 1. the pp pendants are basically a waste of time. Because the signals are polled at low speed, 25 kHz, rely on catching state changes, and often have hw issues as you have seen, they have nothing to do in terms of functionality with real pendants. Ex. A PP MPG wheel, will have high and va...
by hanermo
Wed Apr 15, 2020 1:07 am
Forum: The Junk Drawer
Topic: Any Excel experts out there?
Replies: 8
Views: 1503

Re: Any Excel experts out there?

The second use has the < sign wrong as a typo for GT or greater than 12 when it should be LT or Less Than.
by hanermo
Wed Apr 15, 2020 1:04 am
Forum: The Junk Drawer
Topic: Any Excel experts out there?
Replies: 8
Views: 1503

Re: Any Excel experts out there?

Endless ways to do this. I recommend the easy simple brute force approach. Add columns to the right, referring to the time column. You can hide them later, if you want, but they will still work. 1. For column c, use a format like result = (time >= 0 AND <= 12:00) x time. aka = a1 x ( a1 >= 0 and a1 ...
by hanermo
Wed Oct 30, 2019 9:22 am
Forum: Gunsmithing
Topic: 1911 Project
Replies: 70
Views: 25084

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: 8347

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: 4253

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: 23352

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: 6604

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: 26416

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: 4253

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: 10220

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: 4741

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...