Abrasive Jet Machining Break-Even: About $157K/Month

Fixed costs $19.5K/mo Shop overhead

Contribution margin 60% After variable costs

Break-even revenue $114K/mo Cover monthly burn

Break-even timing Month 2 Early ramp

Break-even calculator

Use this to test whether monthly revenue can cover variable spend and fixed monthly costs.

Lean Base Full

Monthly revenue Revenue is the top line that pays direct costs and overhead. $ Slow month Peak month Variable expenses Include direct material, labor, abrasives, and other costs that rise with jobs. $ Lean cost Heavy spend

Money available to cover fixed costs $90,667 $152,167 revenue - $61,500 variable expenses

Margin ratio

60%

Covers fixed costs

Yes

Fixed monthly costs Include payroll and overhead that stay near the same each month. $ Light load Full crew

Break-even chart Revenue Total costs

Which abrasive jet machining expenses are fixed, and which move with sales volume?

Cost classification

Break-even is only reliable if rent, salaries, materials, abrasive media, labor, and usage costs sit in the right buckets. Misclassifying volume-driven shop costs can make Month 2 break-even look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Manufacturing Facility Rent	Fixed	Include $12,000 per month before calculating contribution margin.	Spreading rent per part and hiding the monthly cash floor.
Equipment Maintenance Contract	Fixed	Include $2,500 per month as recurring shop overhead.	Treating the contract like optional repair work instead of committed overhead.
Senior Machine Operators	Semi-fixed	Model $85,000 per year each, stepping from 2.0 FTE in the first year to 5.0 FTE in the mature year.	Assuming operator headcount rises smoothly with every part.
Aerospace Grade Titanium Stock	Variable	Apply $45 per titanium bracket produced.	Treating stock purchases as fixed inventory instead of unit-level margin pressure.
Garnet Abrasive	Variable	Apply the product-specific abrasive load, from $8 to $18 per unit.	Holding abrasive media flat even when cut volume rises.
Operator, Programming, and Inspection Labor	Variable	Apply $12 to $35 per unit based on the part type and required work.	Putting all labor in salaries and missing per-part labor demand.
Facility Utility Power	Semi-variable	Model as a usage-linked shop burden at 2.0% of revenue.	Budgeting power as a flat office utility while machine hours grow.
Machine Maintenance Reserve	Semi-variable	Model as a wear-linked reserve at 1.5% of revenue.	Treating nozzle wear, pump strain, and maintenance as fixed overhead.

How does break-even change from lean to full shop utilization?

Scenario table

Lean output sits just under break-even, base case clears it, and full output adds the strongest cushion. If variable costs stay near 57% of revenue, contribution margin (CM) is what turns utilization into profit.

Planning assumptions only; realized margin will move with mix, scrap, and staffing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean quote-pipeline case	$152.2k	$86.5k	$67.8k	43.2%	-$2.1k	Sits just below break-even, so missed quotes still matter.
Base repeat-production case	$289.8k	$164.7k	$93.7k	43.2%	$31.4k	Clears break-even and starts funding the next hire set.
Full-capacity uptime case	$420.6k	$239.2k	$119.5k	43.1%	$61.9k	Has the strongest cushion, so uptime and scrap control drive profit.

What pushes this abrasive jet machining service below break-even?

Stress test

Contribution margin is the cash left after variable costs. At the base plan, the service only has a small monthly cushion, so a 10% revenue miss, a 5-point margin squeeze, or a $5K overhead bump can push it into a gap.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Year 1 revenue holds at $1,522K/month and contribution margin stays at 43.2%.	$1.571M/month	$49K gap	Thin cushion leaves little room for idle time.
Revenue shortfall	Year 1 average revenue falls 10% to $1,370K/month.	$1.571M/month	$201K gap	Lower quote wins widen the hole fast.
Fixed-cost increase	Fixed overhead rises by $5K/month.	$1.687M/month	$165K gap	Payroll and overhead leave less room.
Margin pressure	Contribution margin slips 5 points to 38.2%.	$1.777M/month	$255K gap	Abrasive price increases and nozzle wear bite.
Combined pressure	Revenue falls to $1,370K/month and margin slips to 38.2%.	$1.906M/month	$205K gap	Idle time and delayed approvals make recovery harder.

What should you verify before signing the shop lease and buying the waterjet?

Founder checklist

Don’t sign until quoted work clears the $157K monthly break-even line and the Year 1 mix still holds. Also confirm the lease, staffing, and consumables fit the cash plan so Month 5 doesn’t become a squeeze.

1Demand proof$157K/mo

Verify quoted work can support at least $157K a month in break-even revenue, with the Year 1 mix of 1,200 titanium brackets, 800 carbon fiber inserts, 2,500 surgical steel implants, 500 Inconel shims, and 300 ceramic heat shields.

2Lease load$19.5K/mo

Check the $12K monthly rent and the full fixed load of $19.5K a month before payroll, because shop overhead has to stay below booked work from day one.

3Margin test65.5% CM

Validate pricing from $180 to $850 per unit and keep variable costs near 34.5% of revenue, so each job leaves enough contribution margin to pay fixed costs and machine upkeep.

4Staff ramp6.0 to 13.0 FTE

Verify you can open with 6.0 FTE and scale to 13.0 FTE by Year 5, because volume without enough operators, QA, and sales coverage will push rework and delays up fast.

5Cash buffer$699K

Hold at least the $699K minimum cash shown in Month 5, since capex lands early and payback does not arrive until Month 29.

6Launch controlWeekly

Track quote win rate, machine uptime, scrap, rework, and inspection pass rates every week, and do not scale volume until abrasive, nozzles, stock, packaging, and metrology supply are steady.