## Running Cost Spreadsheet Help

## Running Cost Spreadsheet Help

(OP)

Hi guys,

My new Trumpf Laser 1030 has arrived today and Im looking for some advice on running costs. I would like to make a spreadsheet so I can cost parts up for quotations. We have Radan software so it gives me the cutting time to complete the job but I need more info for example.

I know the cost of my gas per litre but I have a formula from Trumpf how to work the amount you use, They say its 2x the nozzel did x 0.555 x gas pressure. this gives me how much gas is being used. Then for electric its so much pence per hour. But I really want to know if anyone has a spreadsheet i could use pls.

My new Trumpf Laser 1030 has arrived today and Im looking for some advice on running costs. I would like to make a spreadsheet so I can cost parts up for quotations. We have Radan software so it gives me the cutting time to complete the job but I need more info for example.

I know the cost of my gas per litre but I have a formula from Trumpf how to work the amount you use, They say its 2x the nozzel did x 0.555 x gas pressure. this gives me how much gas is being used. Then for electric its so much pence per hour. But I really want to know if anyone has a spreadsheet i could use pls.

## RE: Running Cost Spreadsheet Help

First you have your fixed charges (things to pay even if you don't run the machine)

-Depreciation (amount paid for machine / number of years to pay machine back). Then convert to $/hour.

-Interest paid. Based on interest %, calculate interest paid/year, then convert to $/hour

-Space cost (area used * $/ft2. Calculated $ paid per year and convert to $/hour)

-Maintenance. Get quotes for all the PM required in the next 6 years (for example). --> calculate $/hour

Then you have all your variable charges (things to pay based on cutting time):

-Energy. Take machine max kW (including laser, chiller, exhaust, compressor,...). Multiply by your average kWh --> get $/hour of cutting.

-Consumables (price of lenses, nozzles,...). Estimate how many hours you get out of each item (3000 hours on lens, could be less depening on power and gas pressure).

-Laser gas consumption (get flow rate, cost of bottle, volume of bottle and calculate $/hour)

-Assist gas. This depends on material to be cut (get flow rate for a couple of materials, get price/volume unit, calculate $/hour)

-Operator cost

## RE: Running Cost Spreadsheet Help

## RE: Running Cost Spreadsheet Help

For the electricity, this is harder to know how many kW your machine uses based on the power commanded. I would use the kW based on the machine max power. Unless, you can get some type of chart from the machine manufacturer showing kW used per commanded laser W.

## RE: Running Cost Spreadsheet Help

## RE: Running Cost Spreadsheet Help

Problem with liquid oxygen is that the pressure keeps on building inside the tank. This means that when not cutting, you will eventually lose oxygen through safety valve (if not cutting overnight for example).

## RE: Running Cost Spreadsheet Help

## RE: Running Cost Spreadsheet Help

Knowing your gas flow is 40l per minute, and that your part takes 60 seconds to cut (which is 1 minute), volume = 40 * 1 = 40 litres.

## RE: Running Cost Spreadsheet Help

Let me see if Ive got this right.

Gas..

Nozzel dia sq x gas pressure x .555 = CM3 (cubic meters sq per hour)

Example:- 1.5mm dia nozzel SQ = 1.23 x 5 bar pressure x .555 = 3.41 CM3 hour.

My tank holds 240L Liquid oxygen which expands to 201,600L converted to cubic meters would be 201cm3. Air porducts believe you lose 2 per cent a day thats 5L Liquied oxygen.

from this i can work out what im using if its right???

Electic...

the 1030 uses 52 KW full wack so if im paying .10p a KW hr then thats £5.20 an hr to run it??

## RE: Running Cost Spreadsheet Help

Not sure if the formula Trumph gave you is correct. For a 1.5mm nozzle and 5 bar gas pressure, I'm calculating a flow of about 270 ft3/h (about 7.6 cubic meter per hour). For the 2% oxygen loss, that means you'll lose less when the tank gets empty, but that gets too complicated. Assuming 5 l loss per day should be safe.

For the electrical, yes, that seems correct.

## RE: Running Cost Spreadsheet Help

## RE: Running Cost Spreadsheet Help